Whole PC slowed down dont know why!!!!

Pururaj

Distinguished
Jun 30, 2014
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My Whole PC is Slowed Down Don't Know Why,A two weeks ago its working perfectly,when i came back after my vacations it slowed down,it starts hanging GPU performance is very slow,windows experience index is also showing down points on my ram,processor and graphics toooo......dont know why...i tried many things non of them works
please help me if anyone know something
PC Specs:
Windows 7 Ultimate
Intel E2200 2.20ghz(overclocked once but not now)
2GB DDR2 RAM
Nvidia Geforce GT 520 2GB DDR3
Two Hard disc
one:seagate barracuda 80gb
two:samsung 180gb