I've got a Lenovo T500 laptop with WinXP Pro.
It does not boot into Windows, but gets stuck on the Windows Logo screen with the "progress bar" moving but not doing anything.
I can however get into Safe-Mode.
The current problem started when I set up boot time drive check (via Glory). A reboot got stuck on the BootDefragDriver which prevented even SafeMode from loading.
I disabled the service via the recovery console and can now log into Safe Mode.
However, I still cannot boot normally.