The best place to go to learn about overclocking the various components of Windows hardware systems is at the www.tweakxp.com support forum. I don't think this is a great topic for this forum though, as it can do some serious irreversible damage to your hardware and files, and the intention of this is to fix problems not create more. The only people I would really recommend this to are people well trained in setting up computer hardware, those with Pentium 4 'C' editions, or those that would have no regrets over a possible large-scale system failure.
Back on the subject of speeding up your computer, you may want to check your RAM and make sure that it is running at its designed capacity. Right Click "My Computer" and click Properties. On the window that comes up, it should display your computer model, the manufacturer (unless you made it yourself), your version of windows (and xp service pack number), your processor model, your current processor speed, and the amount of RAM you have.
Basically every system configuration will run off of 32MB, 64MB, 128MB, 256MB, 512MB, 1024MB (1G, 2048MB (2G, or a combination of two different ones (ex: 512+256=768M. If the number displayed previous to "MB of RAM" is any other number than one of the configurations above, chances are you have a problem with your hardware and are operating using less Random Access Memory than what your computer was designed for and are subsequently 'choking' your programs off from necessary temporary storage space. If you find you have a problem, post on the computer issues forum or PM me for a recommended course of action.
Rectifying this problem can be one of two difficulties:
Easy, meaning your connection between the motherboard and RAM card is dirty, dusty, loose, etc. To fix this, TURN OFF AND UNPLUG YOUR COMPUTER, then you or someone you trust and knows what their doing (minds static electricity, heat-syncs and wires, and pressure on the hardware, etc.) should open up your computer, remove the RAM, ensure that the slots and 'sticks' are clean, and securely replace it into its original slot and reboot. Check your system properties for any change in RAM. If this doesn't work move on to "Difficult".
Difficult, meaning you have a hardware problem, and either your RAM or motherboard needs to be replaced/repaired. To test this, TURN OFF AND UNPLUG YOUR COMPUTER (Gorky does not want responsibility for an electrified cadaver), then you or someone you trust and knows what their doing (minds static electricity, heat-syncs and wires, and pressure on the hardware, etc.) should open up your computer, and remove the RAM.
If you have ONE stick and TWO slots, place it in the second slot, attempt to boot, and look for a change. If the number improves to match a configuration said above, then your motherboard has a damaged slot but you can probably just ignore it so long as you use one stick. If your memory does not improve, your stick is faulty and needs to be replaced. There are many ways to test more specifically, and if you find you have a problem, post on the computer issues board and/or PM me for advice. Pray for a warranty and hope you haven't accidentally voided it.
If you have MORE THAN ONE stick, boot up your computer using only one stick at a time and see which stick(s) have a lower memory than they should (specified usually on a sticker on the stick). Replace the sticks as you feel necessary (it is of course possible to compute with less RAM). If all the sticks perform well or poorly in one slot, try the second slot one at a time and see what changes occur. Depending on the results, you have a faulty slot and/or a faulty stick which should most likely be replaced/repaired. As above, pray for a warranty and hope you haven't accidentally voided it and if you do encounter a problem, post on the computer issues board and/or PM me for help.
Sorry that was so long winded, I'm finishing up a year's-worth of training on problems like the one above, and it's taken serious hold.