Did you check the company forums for PC tweaks? I am not too ambitious that way, though just enough to have this addy,
http://www.tweaktown.com/ and fearful reserve (The closest I came to overclocking was dating a tech).
The question you asked involves real dedication, or as smurfgod said, real upgrading.
Oh, let me add, I run Morrowind RPG in a select (and radical) hardware mode, it does improve ram, but as benchmarking may or may not prove, does not improve performance. What the test I am referring to did not account for, is how Windows may degrade game play during those times we are not benchmarking. I am not all that informed, but I do think Windows was not made with cyber motocross in mind.

And too, I think certain security suites may have got last night's virus as it installed, but I know that they don't catch it all and are way too happy to tell me how great a job they are doing. I did not like one I had and am sure it was a system hog. I use security I can turn off with my modem. That I found an incontestable improvement, and need be more careful of Phishing, and do regular (non nightstick waving variety high competence) scans.
Note to self: check ID theft protection issues.