|You removed the ASPI layer drivers in the process. That is quite common with WinXP. |
You can either perform a system restore to a date prior to this issue or you can try removing the upper and lower filters. Removing the filters works much of the time but I am not a fan of that process because MS must have put those filters there for a reason.
A third option may also work. Run scannow SFC. Look at the link below to learn how.