Key-logger virus

Hi, my computer has been running really slow out of nowhere and I'm constantly having to reset account passwords because they get logged into from other places than where I normally do. I've had to get multiple new bank cards and have had several instances of false charges on my bank accounts. My antivirus can't seem to find anything wrong but something is definitely wrong with my computer. Need help please.

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Professional, Service Pack 1, 64 bit
Processor: Intel(R) Core(TM) i5 CPU M 520 @ 2.40GHz, Intel64 Family 6 Model 37 Stepping 2
Processor Count: 4
RAM: 3891 Mb
Graphics Card: Intel(R) HD Graphics, 1721 Mb
Hard Drives: C: Total - 295335 MB, Free - 219261 MB;
Motherboard: LENOVO, 2537C84
Antivirus: ThreatTrack Security VIPRE, Updated and Enabled