OK, in case an infection did this first run UnHide
To make your files visible again, please download the following program to your desktop:Unhide.exe
Once the program has been downloaded, double-click on the Unhide.exe icon on your desktop and allow the program to run. This program will remove the +H, or hidden, attribute from all the files on your hard drives. If there are any files that were purposely hidden by you, you will need to hide them again after this tool is run.
Then if needed run SFC...
Please run SFC (System File Checker)
Please run System File Checker sfc /scannow
... For more information on this tool see How To Use Sfc.exe To Repair System FilesNOTE for Vista/WIN 7 users..The command needs to be run from an Elevated Command Prompt.
Click Start, type cmd
into the Start/Search box,
in the list above and select 'Run as Administrator
You will need your operating system CD handy.
Open Windows Task Manager....by pressing CTRL+SHIFT+ESC
Then click File
.. then New Task(Run)
In the box that opens type sfc /scannow
......There is a space between c and /
Let it run and insert the CD when asked.