I installed the new update for TortoiseSVN which requires a restart. Upon restarting a lot of things broke. I'm currently running a virus scan, but what would cause this? Among the things that no longer work is Visual Studio. It now says "Invalid License Data. A reinstall is required" and my wireless internet does not work. When I go to connect to my network it will say "Can not connect" and then when I diagnose the problem it says "The connection to accesspoint-name was cancelled" (and yes, canceled is misspelt like that)

What could have caused this? My computer did not install any updates or anything like that upon restarting and it was running fine before I restarted it.