LogonUI.exe error. Help!!

Hi, I've recently received the following message every time I start up my Vista laptop:

LogonUI.exe
The file or diretory C:\program files\commonfiles is corrupt and unreadable please run chkdsk utility

I've already tried running the chkdsk, but after scheduling a disk check the computer still does not preform one...

can someone help explain to me what this error is, and what problems it is causing my computer? As of right now the only issue I have been having with my computer has been with update errors on my pre-installed MccAffee software. Are there more problems to come? Please help, I'm clueless with computers!!

Have you changed your boot logon recently?

Input the Vista DVD. Run setup - Choose Repair. It will restore it. Fixed.