Computer hard drive speeding up and slowing down

bigboy991

Beta member
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Hi, new to this forum. Recently I got a virus in my system. I removed it using Mcafee, spybot and malwarebytes in safemood. Now, once in a while my hard drive speeds up all of a sudden (makes noise) and then after some time slows down. Any idea what could be happening? The antivirus and spyware removal tools are not detecting anything.
 
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