Full screen option signs me out

[Susan]

When the full screen option is chosen an error message is
displayed and it closes all the windows and signs me off
the internet. What can I do to fix this problem?

Thank you for your help.
Susan

 

[R. C. White]

Hi, Susan.

Perhaps one of your operating system files is damaged. The System File
Checker can fix this problem. At the Run prompt, type: sfc scannow

SFC will compare each Windows file with the "known good" copy kept in your
on-disk cache and replace any missing or damaged ones. Have your WinXP
CD-ROM handy; SFC probably will want to see it.

RC