FPS lag? but i have a fair PC!

Hello fellow summoners , i'm facing an annoying problem! You see , i used to run my PC on 60-100 FPS but now it's litteraly 10-60 , sometimes 1 in teamfights lul.. - I did everything you could do , i even started playing without a sound xD any tips? ***_i do have a good pc specs dont tell me to buy a better one_*** Operating System: Windows 7 Ultimate 32-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_rtm.101119-1850) System Manufacturer: TOSHIBA Processor: Intel(R) Core(TM) i3-2312M CPU @ 2.10GHz (4 CPUs), ~2.1GHz Memory: 2048MB RAM ***also one more thing , i once downloaded a game which exceeded my the specs , (too big) , didnt notice until i finished playing it , does it affect? if so , how could i fix it***
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