Viruses enter in the form of a file downloaded and hence safeguard it by installing anyantivirus software and by keeping the firewall on. In the same way if a computer’s performance has drastically dropped, the soluion is press CTRL+ALT+DEL and check in the performance tab, it is always that the CPU usage level should at the maximum be 2% .
If a computer works very slow ,use the System Restore option. Select from control panel and restore it to various restoration points that are aavilable ,this process takes sometime and you get back your system as you had before .
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