Probably best to run it directly from the command prompt.
Go Start - or press the Windows key - type cmd then right click on cmd and select Run as administrator - accept the UAC then enter chkdsk /f
You'll get a message that it cannot be run and prompted to type y and press enter for it to execute on the next reboot.
Type and enter y then enter shutdown /r /t 00 which will effect an immediate restart then just wait for it to do its thing.
It will give its report briefly on the screen, but if you miss it, after it restarts, go Start - type eventvwr and press enter.
When Event Viewer has read the data, expand Windows Logs - click on the name Application then on Action in the menu bar and then on Find.
In the Find box type chkdsk or wininit and press enter.
Cancel the Find box to read the full report in the scrollable window.
I see Julian has given you the first bit while I was typing
- however, just use the /f switch for now and note if it reports any KBs in bad sectors.