More specs are needed first. many things could be;
is your DVD win 7 compatible?
what version of Windows 7 RTM are you using?
where did you get your download?
is your install borked?
is your install corrupted?
what version x86 or x64?
Quote:
The software giant even revealed the specific devices that are affected by problems: “This problem may occur if you use one of the following DVD drives on the computer: Sony BC-5100S DVD, Sony BC-5600S DVD and TSST TS-L633B DVD+/-RW.”
According to Microsoft there are two workarounds that end users can turn to. The first is the simplest, and it involves updating the firmware for Sony BC-5100S DVD, Sony BC-5600S DVD and TSST TS-L633B DVD+/-RW. “To check for an applicable firmware update, contact the manufacturor of the DVD drive,” Microsoft noted.
Windows 7 also states only 4 Sony devices are Windows 7 compatible.
None listed above are in the list.
Therefore it is the Device Manufacture not Windows 7 the OS.