I'd start with system restore back to before that fatal skype call.
If that doesn't help, go back to factory conditions (reinstall Windows).
If that doesn't help, it's a hardware issue, but that's unlikely.
So. Ive had my PC for about 2 months now, received it from my cousin.
Im not very tech savvy, but its got 12gb of ram, 4gb memory and runs on an i5 processor.
Its been perfect up until a skype call a few days ago when i shared screens. It has progressed until now where everything is completely unresponsive!! My mouse will sketch around the screen, programs will take up to 2 minutes to open, like a simple google chrome tab. Its just gone to ****!! Ive gone into task manager and noticed that my ram is capped at idle? I have no programs open, yet i have 0 of 12gb of ram free, its all being used on nothing. Have I got faulty ram?
I really need help, need this pc for gaming and Uni, please help boys.