Hey, we've all been there. Keep that AV program up to date and periodically scan for malware/spyware. Download and install a good 'firewall' too. You can get all of this stuff FREE at CNet Downloads;
http://download.cnet.com/windows/
Here's my recommendations on the BEST FREE Anti-Virus and spyware/malware Programs on the Market that you can download from CNet.
* Advanced System Care
* AVG Anti-Virus 2013
* Malwarebytes
* Spybot Search & Destroy
* Crap Cleaner
and last, but not least,
* ZoneAlarm FREE firewall
I run every single one of these AT LEAST once a week. (My Computer purrs like a Kitten and works like the day I removed it from the Box because of my high maintenance and the use of the above mentioned programs).
Best of luck to you!