Answers:
Do you own a software firewall installed on your computer? If yes, your firewall software may not be detected by Microsoft Security Center. But no worries, newly get sure that it's running fine.
sounds approaching a virus if your not competent to begin control panel. i would run a scan first. if it finds oe later use this tut.
http://aresforum.net/modules.php?name=fo...
an confident to take in step by step tut i wrote on how to remove a virus properly, no situation what anti virus program you use.