Download crystalmark and run a quick bench then upload a screen shot. Slow hard drive can bottleneck the fastest systems out there. It is one if not the main reason why most systems out there suffer performance related issues. Most here though mostly only focus on high sequential read and write performance but low random 4k hurts performance.
So I suggest that either you upgrade your hard drive to a better performing model or pair it up with a cheap ssd. Now you must be wondering how to pair up drives without using raid and still improve performance well for the most part you can move the page file (win xp, vista, 7, and 2008). It is very easy to move the page file to a faster drive while allowing the other drive with os and applications to perform better without managing the page file at the same time.
Start, control panel, system, performance, virtual memory tab/option.