Your product key problems were nothing to do with Sony, it was because the
product key on the sticker was for an OEM version of Windows XP (likely home
or pro edition) and you were using retail CD's, except for Media Center,
which is OEM, but the key was likely not for Media Center. It may be
frustrating, but don't blame your lack of knowledge on Sony.
All laptops are proprietary, have been for yeas and years.

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"pheasant" wrote in message
...
priyank wrote:
hi.. i just downgraded my sony vaio vgn-c25g from vista to xp.. but i
could not get xp sound card (PCI) driver.. need help..

Just finished reinstalling XP on a Vaio for a friend. NEVER again.
After formatting with a generic XP disk(home,pro or media center) it
wouldn't accept the license pasted on the back. Luckily was able to get
it booted, and let Sony's website tell me exactly which Vaio disk to
order.
Long story short, very proprietary. Let Sony's website autodetect exact
model, spend the 20 bucks for reinstall disk. Hopefully there will be one
for XP for it.
Good luck.