i have tried this
1. Now go to Control Panel -> System -> Hardware -> Device Manager
1a. Under SCSI and RAID controllers delete the key for vax347s (or a347scsi for previous version)
1b. Under System devices delete the Plug and Play BIOS Extension

but the drive or key is not under SCSI and RAID controllers but it is under DVD/CD-ROM drives and i have unistalled it from but it keep coming back after i reboot...what else can i try to erase this virtual drive?

I suggest that you reinstall alcohol, then set your number of virtual drives at 0 and then uninstall via add/remove programs. That method generally removes any virtual drive created by alcohol.

thank you for your advice but i have tried that too

Which trial version did you have installed?

I cant really say i dont remember the first one i had but when i re installed it i had 1.9.5.4327

Can you reinstall Alcohol and post a complete system report so we can see what driver may be still residue on your system?

########################### System Information ###########################
Windows XP Home Edition 5.1 Service Pack 2 (Build 2600)
Processor info: Intel(R) Pentium(R) 4 CPU 2.80GHz (2790MHz)
Memory Available to Windows: 1,046,528 KB

############################ Program Information ###########################
File Name: C:\Program Files\Alcohol Soft\Alcohol 120\alcohol.exe
Company Name: Alcohol Soft Development Team
Description: Alcohol 120%
Original: alcohol.exe
Product: Alcohol 120%
Trademarks: Alcohol Soft Development Team
Copyright: Copyright(C) 2002-2006 Alcohol Soft Development Team
Version: 1.9.5 ( Build 4327 )
Date: 2006/07/29
Size: 1308032 Bytes
Hash: b4a2f07dfed24d3d2dbf8387cf5f6c09
File Name: C:\Program Files\Alcohol Soft\Alcohol 120\alcoholx.dll
Company Name: Alcohol Soft Co., Ltd.
Description: Alcohol virtual device control library
Original: alcoholx.dll
Product: Alcohol
Copyright: Copyright (C) 2000-2006
Version: 4.3.0 ( Build 0 )
Date: 2006/01/25
Size: 403352 Bytes
Hash: 8c1efe717203eed1b9f91da81083ba1c
File Name: C:\Program Files\Alcohol Soft\Alcohol 120\devsupp.dll
Company Name: Alcohol Soft Development Team
Description: Alcohol Software Device Capability Library
Original: devsupp.dll
Product: Alcohol Software Device Capability Library
Copyright: Copyright(C) 2002-2006 Alcohol Soft Development Team
Version: 2.5.1 ( Build 1926 )
Date: 2006/07/26
Size: 46592 Bytes
Hash: 520a7755900c5b95a0f7535c999e3b1c

########################### User Information ###########################
Licensed to: UN-REGISTERED ( 6/2/2006 )
Registered User ID: UN-REGISTERED

########################### Options Setting ###########################
Devices control interface: Default Driver Control Interface
CPU Priority Level: High
Memory Buffer Size (MB): 128
Examine the accuracy of data read from physical device: Yes
Turn off "Auto-Select best write speed" function if possible: No
Overburn disc(s): No
Fill memory buffer before recording discs: Yes
Ignore Media Type: Yes
RMPS (Recordable Media Physical Signature) Emulation: No
BAD Sectors Emulation: No
Sub-Channel Data Fixed & Emulation: No
Laserlock Emulation: No
Current Language: English

############################ Device(s) List ############################
(D SAMSUNG CD-R/RW SW-252S (atapi, Port 1, Bus 0, Target 0, Lun 0)
(E ZX9048O VDT685X (dtscsi, Port 2, Bus 0, Target 0, Lun 0)

##################### Installed Device Drivers List #####################
ACPI.sys aeaudio.sys afd.sys Aspi32.SYS atapi.sys
audstub.sys bcm4sbxp.sys Beep.SYS BOOTVID.dll Cdfs.SYS
cdrbsdrv.SYS cdrom.sys CLASSPNP.SYS disk.sys drmk.sys
drvmcdb.sys drvnddm.sys dtscsi.sys dump_atapi.sys dump_WMILIB.SYS
Dxapi.sys dxg.sys dxgthk.sys eeCtrl.sys EraserUtilRebootDrv.sys
fdc.sys Fips.SYS fltmgr.sys Fs_Rec.SYS ftdisk.sys
GEARAspiWDM.sys hal.dll HIDCLASS.SYS HIDPARSE.SYS hidusb.sys
i2omgmt.SYS ialmdd5.DLL ialmdev5.DLL ialmdnt5.dll ialmnt5.sys
ialmrnt5.dll imapi.sys IntelC51.sys IntelC52.sys IntelC53.sys
intelppm.sys ipnat.sys ipsec.sys isapnp.sys kbdclass.sys
kbdhid.sys KDCOM.DLL kmixer.sys ks.sys KSecDD.sys
mnmdd.SYS Modem.SYS MODEMCSA.sys mohfilt.sys mouclass.sys
mouhid.sys MountMgr.sys mrxdav.sys mrxsmb.sys Msfs.SYS
msgpc.sys mssmbios.sys Mup.sys NAVENG.Sys NavEx15.Sys
NDIS.SYS ndistapi.sys ndisuio.sys ndiswan.sys NDProxy.SYS
netbios.sys netbt.sys Npfs.SYS ntdll.dll Ntfs.sys
ntoskrnl.exe Null.SYS omci.sys parport.sys PartMgr.sys
ParVdm.SYS pci.sys pciide.sys PCIIDEX.SYS portcls.sys
psched.sys ptilink.sys PxHelp20.sys rasacd.sys rasl2tp.sys
raspppoe.sys raspptp.sys raspti.sys rdbss.sys RDPCDD.sys
redbook.sys RT2500.sys SAVRT.SYS SAVRTPEL.SYS SCSIPORT.SYS
serenum.sys serial.sys smwdm.sys SPBBCDrv.sys sptd.sys
SPTD2733.SYS sr.sys srv.sys sscdbhk5.sys SSFS0509.SYS
SSHRMD.SYS SSIDRV.SYS ssrtln.sys swenum.sys SYMDNS.SYS
SYMEVENT.SYS SYMFW.SYS SYMIDS.SYS symidsco.sys symlcbrd.sys
SYMNDIS.SYS SYMREDRV.SYS SYMTDI.SYS sysaudio.sys tcpip.sys
TDI.SYS termdd.sys tfsnboio.sys tfsncofs.sys tfsndrct.sys
tfsndres.sys tfsnifs.sys tfsnopio.sys tfsnpool.sys tfsnudf.sys
tfsnudfa.sys update.sys usbccgp.sys USBD.SYS usbehci.sys
usbhub.sys USBPORT.SYS usbprint.sys usbuhci.sys vaxscsi.sys
vga.sys VIDEOPRT.SYS VolSnap.sys wanarp.sys wanatw4.sys
watchdog.sys wdmaud.sys win32k.sys WMILIB.SYS ws2ifsl.sys

################## Detailed Information of Device(s) ##################

///////////////////////////////////////////////////////////////////////
(D SAMSUNG CD-R/RW SW-252S(1:0) detail information.
///////////////////////////////////////////////////////////////////////
Vendor Identification: SAMSUNG
Product Identification: CD-R/RW SW-252S
Production Revision Level: R902
Location: atapi, Port 1, Bus 0, Target 0, Lun 0
Support recording method: DAO, RAW SAO, RAW SAO+SUB, RAW DAO(96), TAO
BURN-Free Technology: BURN-Proof
Auto-Select best write speed: Not Supported
-* Note: This information below is provided by the unit, it might be inaccurate. *-
-* This software does not use this information! *-
Removable media: Yes
Version: ATAPI (INF-8090i/INF-8020i/INF-8028i)
Response Data Format: 02h
CD-R Read/Write: Yes/Yes
CD-RW Read/Write: Yes/Yes
Read CD-R Fixed Packet: Yes
Test Write: Yes
DVD-ROM Read: No
DVD-R Read/Write: No/No
DVD-RAM Read/Write: No/No
Audio Play: Yes
Composite Audio and Video Data Stream: No
Digital output (IEC958) on port 1 Supported: No
Digital output (IEC958) on port 2 Supported: No
Mode 1 Form 2: Yes
Mode 2 Form 2: Yes
Multi-Session: Yes
BUF: Yes
CD-DA Commands supported: Yes
CD-DA Stream is Accurate: Yes
R-W Supported: No
R-W De-interleaved and Corrected: No
C2 Pointers Support: Yes
ISRC Supported: Yes
UPC Supported: Yes
Read Bar Code: No
Lock media into the drive: Yes
Currently drive Lock state: Unlocked
Prevent Jumper: No
Eject Command: Yes
Separate volume levels: Yes
Separate channel mute: Yes
Changer Supports Disc Present: No
Software slot selection: No
Side change capable: No
P through W in Lead-In: Yes

///////////////////////////////////////////////////////////////////////
(E ZX9048O VDT685X(2:0) detail information.
///////////////////////////////////////////////////////////////////////
Vendor Identification: ZX9048O
Product Identification: VDT685X
Production Revision Level: 1.0
Location: dtscsi, Port 2, Bus 0, Target 0, Lun 0
-* Note: This information below is provided by the unit, it might be inaccurate. *-
-* This software does not use this information! *-
Removable media: Yes
Version: ANSI X3.131:1994 (SCSI-2)
Response Data Format: 02h
CD-R Read/Write: Yes/No
CD-RW Read/Write: Yes/No
Read CD-R Fixed Packet: Yes
Test Write: No
DVD-ROM Read: Yes
DVD-R Read/Write: Yes/No
DVD-RAM Read/Write: Yes/No
Audio Play: Yes
Composite Audio and Video Data Stream: No
Digital output (IEC958) on port 1 Supported: Yes
Digital output (IEC958) on port 2 Supported: No
Mode 1 Form 2: Yes
Mode 2 Form 2: Yes
Multi-Session: Yes
BUF: No
CD-DA Commands supported: Yes
CD-DA Stream is Accurate: Yes
R-W Supported: Yes
R-W De-interleaved and Corrected: Yes
C2 Pointers Support: Yes
ISRC Supported: Yes
UPC Supported: Yes
Read Bar Code: No
Lock media into the drive: Yes
Currently drive Lock state: Unlocked
Prevent Jumper: No
Eject Command: Yes
Separate volume levels: No
Separate channel mute: No
Changer Supports Disc Present: No
Software slot selection: No
Side change capable: No
P through W in Lead-In: No

#######################################################################