* DVD / CD-ROM disappeared *

Dear experts,
I'm having Win XP Pro + SP2 in my COMPAQ laptop.

I have installed SP5 for Visual Studio 6.0, after that DVD drive had
disappeared from the windows explorer. When I checked with "Device Manager",
it says driver files are corrupt ( Error code: 39 ).

I tried following methods to fix the problems.

- I tried "System Restore", but it did not fix the problem.

- I uninstalled and reinstalled the driver, but again says driver files are
corrupted ( code: 39)

- I looked at the DVD drive manufacturer's website, it says there is no
special driver available and
the XP OS itself provides it. For the same reason, I could not get the
driver from COMPAQ also.

- Fortunately, I had complete XP installation files, but unfortunately when
I attempted for reinstallation,
it quits by saying that I already have a more recent version than the one
currently being installed.

How can I fix this problem.
Will reinstalling SP2 solve the problem ?
Is there any standard DVD / CD-ROM driver download available for XP Pro ?

Experts, kindly help me.

Regards
Kumaran