BEHOLD THE SOLUTION! As late as I may be, and you may already have came across this but here goes -

I have an Optiarc AD-7530A in a gateway laptop running Vista, the bugger doesnt appear in My computer at all, so I followed the steps on this microsoft link - http://support.microsoft.com/kb/314060
following from -
Method 2: Manually delete the registry entries

and it appeared. Even though it states XP, the process is still the same.

Hope it works for you too!

Later!

Arnieo