Nope it came with a 60 day free trial, so what anti-virus and malware programs would you recommend?

I updated just recently I know it isn't up to date but I don't think that has to do with the crashes. Any ideas of what may be causing the crashes?
Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft® Windows Vista™ Home Premium, 32 bit
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 4400+, x64 Family 15 Model 107 Stepping 1
Processor Count: 2
RAM: 1917 Mb
Graphics Card: NVIDIA GeForce 6150SE, 128 Mb
Hard Drives: C: Total - 296250 MB, Free - 265195 MB; D: Total - 8992 MB, Free - 1027 MB;
Motherboard: ASUSTek Computer INC., NARRA2
Antivirus: None
Here is a picture of the screen when it crashed
