I dont think so there is any case of a virus. Check to see if The windows firewall service is running.
Type services.msc & go to Windows Firewall->It should be STarted->Automatic.
If not, click on its properties, & set state to automatic
If it doesn't work, you may have to reinstall SP 1 or 2, it came bundled with digit a few months ago.
Savvy
