In the past month or so I have encountered an issue with my computer where shortly after startup, the CPU and memory usage both go to 100% and remain there the entire time my computer is running. Applications now take a very long time to load, and there is even significant lag when moving the mouse or typing. The computer will also emit intermittent system beeping sounds and I frequently get a Windows error that pops up with a message along the lines of "Powershell Unexpectedly Stopped."
I am running Windows 7 Professional 64 Bit w/ SP1. ESET and Malwarebytes scans both turned up clean.
Any help that you can offer would be greatly appreciated.