PC became too slow suddenly??

I own a PC -

Intel core 2 duo 2.8 ghz
ATI Radeon 6670 GPU/
200 W psu

PC was working fine for like 2-3 months.
Today suddenly baam tooo slow.
Veryy laggy.

A difference i notice is from my Cabinet i hear a loud noise of whirling fan (never heard before)

And then it suddenly stops and everthing ok for some time.

Then again loud noise and lagg.

[p.s. many times while switching from lagg to no lagg i get a windows error -conhost.exe has stopped working]
4 answers Last reply Best Answer
More about slow suddenly
  1. Best answer
    Check for viruses and also post temperatures.
  2. Please tell me how to check temperatures.
  3. Bitdifender rocksss!!

    Scanned my PC with it virus gone in 2 mins..;P
    Thanx Foldalot
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