Hi there,
The Facebook connect feature here will not spread any viruses.
Everyone should have their virus scanner up to date. If you do not have one, you can get this one for free:
http://free.avg.com/us-en/homepage
You should also clean up your registry. This is a good tool. http://www.ccleaner.com/
And... the last free one I recommend to keep Malware at bay is: http://www.malwarebytes.org/
Good luck...
Admin