My PC keeps crashing. Blue screens, and programs crashing constantly. i cant for the life of me figure out what the problem is and its incredibly frustrating. I consider myself to be knowledgeable about computers and pretty handy over all but this one has me stumped. this issue started about a week ago and i have tried everything from virus scans to a complete reformatting of my hard drive. i just cant figure out the issue. I have run mem diagnostics and my ram seems to be fine. re-installed and updated drivers, everything. if anyone could help me i would be eternally grateful. let me know if there is any specific info i can provide that will be of assistance. the machine is two years old, i built it myself. samsung SSD, evga 660ti GPU, intel i5 processor, running on windows 7 home edition.