vid_88, there are a few things you can check. Most prolly (about 99.99%) imo its a hardware problem so check if there is a prob with your ram. Just shut down your pc, remove your ram, just wipe it clean with a cloth and reconnect it (assuming you know how to do all this)
Also just check if your processor fan and stuff is functioning cause sometimes it could be because of overheating.
Afaik, plus! and/or wlm. Just check these things out if you can or get someone who can check them for you