files open and then close immediately

  Ether 11:45 12 Apr 2007
Locked

I have ie7: when I search and open a site it stays open for a few seconds and then closes down and reverts to the home page.
MS Outlook: Similarly when I open an e-mail it stays open for a few seconds and then closes down. It then scrolls through all the e mails until it displays and closes the most recent one.
Windows explorer: I open a folder, it displays for a second and then closes and defaults to the list of My Documents.

I have scanned for viruses, trojans and malware and the computer appears to be clean.

Any ideas?

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