I am using a Dell Dimension 9100 desktop. I had purchased this a year ago. It came with Windows XP Home edition. I install a free edition of Avast in the system. My brother also uses the same system. Accidentally he had installed AntiVirus System Pro in my system. It is a fake antivirus and I do not understand why AVAST did not blocked it. It has made my system extremely slow. I cannot improve its performance nor I can find any other way to make it better. There are more virus installed in my system. AVAST gives warning but cannot clean it. It looks the entire system is screwed up. What can I do to make it as it was before.
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