Hi guys I recently got a new HDD installed, an extra 512mb stick of ram, new mobo and CPU, new PSU, etc. Anyways, it's a fresh install of windows, and i've started to expierence problems. Sometimes I'd be in a game, and for no reason it would freeze, and the sound would skip for like 5 seconds, then the computer would go to a blue screen saying something about an error, I don't remember what exactly the blue screen said but I remember something about kernel? kernel32.dll? and another time it said something like sysapi.something - don't remember

Anyways it would go to the blue screen, then it would restart itself. After it restarted the bios startup screen would appear, and the part where it says "Primary Master" and "Primary Slave" would show something completely random, like just a bunch of different letters. Then it would go to a new page, and have another error message. Anyways it did this recently, and after this happened the monitor wouldn't come on at all, I would turn the power on the computer but the monitor wouldn't display anything so I removed the old ram stick, and the monitor started working properly again. Anyways now the computer is really really fps laggy, when loading applications like firefox or doing scans of any sort the mouse will lag, sometimes even freeze. In games the sound is all fuzzy, and the game is really fps laggy and glitchy, like every few seconds it will skip, it's hard to explain

Sorry that I couldn't give any better descriptions

any help would be great, thanks everyone.