Slower computer not sure of reason

My problem is after several power outages, I noticed my computer is running slow, all my games run at 10 fps maximum, when I used to get over 70 fps, Even videos are suffer from fps drop, I tried cleaning the PC, fans are running alright...

My Specs:
OS Version: Microsoft Windows 7 Ultimate
System RAM: 4055 MB
CPU Name: Intel(R) Core(TM) i7 CPU 860 @ 2.80GHz
CPU Speeds: 1704
Physical CPUs: 1
Virtual CPUs: 8
Video Card Description: ATI Radeon HD 4600 Series
VRAM: 1024 MB
Primary Display Resolution: 1366x768
Multi-Monitor Desktop Resolution: 1366x768
Microphone: True
Language: English (United States)
Free Hard Drive Space: 44873 MB
Total Hard Drive Space: 99898 MB
Windows Experience Index Rating: 5.3
1 answer Last reply
More about slower computer reason
  1. Hi :)

    Usual two reasons for sudden slowness...

    1, Virus...

    2, Crashed hard drive...

    Test for both...

    All the best Brett :)
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