I have the problem where my PC is stalling repeatedly at random. I was running Windows 7 Home Premium 64-bit before, but I formatted and reinstalled Windows today. I have run Malwarebytes Anti-Malware full scans on both my C: Drive and my D: drives after I reinstalled Windows, where I backed up my files to. Nothing weird showed up there. I have MSE as well. I am now running Windows 7 Ultimate 64-bit. It's a genuine copy with a product key I received through my school. I believe that the problem might be caused by hardware rather than software at this point. I built my computer about 4 years ago and I've had to replace some of the parts already. One stick of RAM isn't working so I took it out. It's pretty old so maybe a part is dying out. Specifications: Intel Core i7-920 Bloomfield 2.66 Ghz OCZ Gold 6 (3x2) 4 (2x2) GB RAM Western Digital Blue 500 GB (Windows is installed on this drive) Western Digital Blue 1 TB (New) MSI Radeon HD 7790 1 GB (New) Foxconn FlamingBlade GTI Antec TruePower New TP-750 750W Here is the build at PC Part Picker: http://pcpartpicker.com/b/CJU Is there any other information that might help to diagnose this problem? Just let me know if there's anything else I can supply.