Unhandled exception 0xC0000005 in migcore.dll when upgrading to Vi

When upgrading from Windows XP to Windows Vista Ultimate Edition, the
following error occurs:
FatalError PANTHR Unhandled exception (code 0xC0000005: ACCESS_VIOLATION)
occurred at 0x7489D637 in C:\Windows\system32\oobe\migcore.dll (+0047D637).
Minidump attached.
Installation is terminated and rolled back. This information was logged in
the file C:\$WINDOWS.~BT\Sources\Panther\setupact.log.

Does anybody knows what's wrong? Thank you all