Windows failed to start on Sony VAIO Notebook with Windows XP?

You have to burn your own recovery CDs from the recovery partition, but since you cant do that now. Try this , turn on the computer and tap the f8 key a menu should come up, "scroll to the use last good configuration that worked " hit enter. If that doesnt do it> Go to the sony site or look in your manual and 1st see how to run chkdsk from a cold boot, it may be a repairable error. (chkdsk just scans for errors and repairs them) if not see what the f key shortcut is to repair or reinstall windows from you recovery partition.