Randomly closing programs and background disapears.

Recently after installing a new graphics card, I've been having weird issues with my computer. Google Chrome tends to close without any sort of warning (I have re installed it) without any correlation, just completely random. Also, sometimes my computer basically shuts itself down. Out of nowhere, every single program will close (besides the one I'm currently using, usually at least) and the background of my desktop will turn green (the default color I chose for windows 8) with all of my icons and task bar and everything disappearing. If I have task manager open, oddly enough, it won't close. I can't open the start menu, even using the keyboard windows key, and the only way to fix it is to either restart the computer and log out then back in. I'll try to get a screenshot the next time it happens, if it allows me to. I previously had an AMD HD 7770 for graphics card. Oddly, notice how in the TSG SysInfo how it says "-1Mb ram" when it should be 4gb


Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 8.1, 64 bit
Processor: Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz, Intel64 Family 6 Model 60 Stepping 3
Processor Count: 8
RAM: 8111 Mb
Graphics Card: NVIDIA GeForce GTX 760, -1 Mb
Hard Drives: C: Total - 953516 MB, Free - 501989 MB;
Motherboard: ASRock, B85 Pro4
Antivirus: Windows Defender, Disabled