Vista CD not reading, DVD drive AND DVD disk is good

[Yudai]

Hi there,
I'm presently running Windows 7 and I'd like to switch to Windows Vista 32 bit. I have both Vista Home Premium and Vista Business, however the two CD's won't read, neither while logged on windows, or when I try to boot the disk after bios booting (yes, I set CD/DVD drive as first in booting sequence).

I'll say in advance, I deleted the windows.old folder so now I can't revert to Vista that way.

I would say it's the CD/DVD drive, but I've inserted other CD's/DVD's and they were read completely with no trouble. As well as, I'd say it's my Vista disks that are bad but the business disk was sealed in the original "paper cover/container", therefore there are no scratches or damage to the disk.

I want to also mention that windows update is up to date.

I'm running on a Dell Studio 1535, any thoughts on what might be preventing me from reading and installing Windows Vista?

[admin]

Try the disks on another PC or laptop. It's possible that the CD/DVD drive has gone bad. If the disks don't read on other machines, you can probably get replacements from Microsoft at a nominal cost or perhaps they have an image available that you can download - and I have seen these available online.