before reinstalling,, try checking the ram,, there are good ram test utility available at simmtester.com,,
plus, if you want to look at the Antivirus issue,, either remove it from the start up folder and disable it,, or uninstall just the antivirus software , reboot,, and then check performance,,,
plus,, what is the size of the harddrive, how do you have your pagefile setup,
Lets just start with the memory
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