I mainly use my computer for music and a game called League Of Legends and whenever i start up my game it will lag every so often and be at 1 fps and then at around 20 minutes the game and my computer will freeze and i will get the buffering sign on my cursor. I cannot open up anything like task manager or even bring up the command prompt.I have disk usage at 100% and the start up is always very quick. It says system is using all the disk space but this makes no sense to me. I dont have an anti virus but i am using the windows defender to look for malware. Could this possibly becauser i have too much dust and it makes my pc slower than ever?? I couldnt give you guys all my specs because i am not a whiz i just play this one game and thats about it. Please help me and if anyone could possibly add me on skype to walk me step by step i would be forever thankful. Thank you