The most important things to assure Windows 7 meets its standard of instantaneous performance is adequate hardware with a perfect install. This means you should max your RAM if you intend to do gaming, don't even think about running the factory bloatware install which is worst of all with HP.
Instead get a perfect Clean Reinstall - Factory OEM Windows 7
If you're using 4gb RAM then 32 bit is fine for the reinstall, although you can try 64 bit to see the difference.
Never use optimizers or registry cleaners with Windows 7, just the tools and methods mentioned in Clean Reinstall tutorial to get and keep a perfect install. You can improve performance some using Optimize Windows 7
especially editing Visual Effects of fading, sliding, animation, dragging intact and selection rectangle which hog RAM.