Computer is very slow after putting in graphic card

my computer becomes very slow when I try to install nvidia geforce gtx 550 ti graphic card. when I switch back to onboard card everthing is ok... and then when I try to install again it's the same problem I scanned with Avast antivirus and found no virus,I reinstalled my windows but still didn't fix the problem, I updated the drivers but computer is still very slow..and my cpu is always at 100% when there is no programs running..

I have psu 550w, AMD Athlon(tm) Processor 3200 2.00ghz and 3gb ram
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More about computer slow putting graphic card
  1. A bottleneck I guess...
  2. ya im guessing your processor just isnt up to snuff.

    i had a similar experience putting a gtx 285 on a processor like yours.
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