format > fresh install & issues?! ...sounds like a very old computer. specs?
most computers have a diag partition to test out hardware (or came with a disc)..
if not, here is a 3 second search result:
http://www.ehow.com/how_2293086_test...paign=yssp_art
(goto: Start > Run ..type: taskmgr) is your CPU/memory maxed out? that would be my best guess.
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