Strange Vista Bug Continues...

Ok, following on from the bug i had (ive pasted the details below again) Ive
scanned the drive with the maxtor/seagate tools and no problems. It seems
to be something to do with the harddrive as if is start a checkdisk it
almost instantly causes problems, you can move the mouse but nothign
responds. If you try and go into ctrl-alt-delete you get a message saying a
'logon process has failed to create the security options dialog'. It seemed
to start when i put an old harddrive onto the system to copy data across,
until this point everything was fine.

Any other suggestions would be great