[MailPlus] clean install,virtual memory

[dwi Pc]

Hai rekan milis,
istilah clean install,apa sm dg format ulang?
Dan apkh virtual memory sm dg RAM?
Istilah tsb sll muncul di sys tray,bhw virtual memory is low..Ud sy disk 
cleanup,tp tetap muncul. Gmn cara mengatasinya?Thx y.Mohon pnjelasannya.