My Computer

Well, I've tried both Avast and AVG before. Didn't like it much.
The ram I'm using usually fluxuates around 2%~20%.
If I click a link or copy files or anything, it quickly hits 100% and then reduces back to 2%~20%.
Quickly as in only lasts 1 or 2 seconds.

That doesn't seem to be too much of RAM usage so I'm a bit confused about the problem as well. Since I don't have any definite solutions, I'll give you some suggestions on what next to try.

1. Download either the NOD32 or Kaspersky Free Trials, and disable AdAware for the time being. Update the Virus Definition of the one you chose to download, and reboot your computer. During the boot screen, get into Safe Mode (the screen should tell you what button to free. Might be F8 or F2) Once in safe mode, fire up the Anti Virus program and get cracking. Hopefully, you'll find something that might be causing you the trouble.

2. One by one, start disabling certain programs from startup. You can do this by downloading WinPatrol or just clicking 'Start' > 'Run' > and typing 'msconfig.exe'. Navigate to the 'Services' tab and start disabling the programs you have. Just make sure you don't disable any drivers or anything important like that.

3. This is a bit drastic. Backup everything you have on an external drive, and reformat/reinstall windows. Then get into your backup folder and only take out the files that you absolutely need.

4. If it comes down to it, consider buying another stick of RAM. It's a great thing that RAM is cheap nowadays. You can probably get a 1G stick for $30.