also look at the task menu and see what all processes are running.. it should tell you what is sucking most of the process and memory.. Look up any entries that are extremely high.. A virus scanner, especially a non updated one, can miss viruses, but a sure sign of a virus or trojan is a process using memory like no tomorrow.
And what rc45 is talking about is the virtual memory.. You should try to maintain at least 500 megs free harddrive space at all times to facilitate the growth of the swap file.
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