Check Disk Error

My computer has run chkdsk /f since I got it a few months ago w/o a problem, but starting just about a week ago, whenever I attempt to run it, I get this message during reboot:

Autochk cannot run due to an error caused by a recently installed software package. Use system restor to bring it to a time before the software.
An unspecified error occured (766f6c756d652e63 3f1).

Then it simply takes me back into Windows. Any ideas what might be causing the problem? Any ideas how to fix it?

The weird thing is, I haven't installed any software programs recently and chkdsk worked fine up until just a few days ago. Perhaps it was a system or software update?

Thanks for your help!

--David
Win 7 Pro - 64 bit

Hopefully you have resolved this by now but I'll throw an idea out there anyway ...

How about automatic updates, such as the Windows update Service Pack 1? If you have automatic updates then things do get installed even if "you" didn't do it.

If you go to Control Panel \ Programs and Features ... View Installed Updates. Anything there near the time? You might also try System Backup and Restore and restore your system to a time prior to the error.