If I can jump in here...Here is one problem right here;
in Running Processes;
C:\WINDOWS\system32\cidaemon.exe
If you are using a Windows XP-based computer, the computer may run slowly. Additionally, you may see the following symptoms in Windows Task Manager:
• The current CPU utilization is high.
• The size of the pagefile may be as large as 1.2 GB or more.
• The Cidaemon.exe process uses lots of pagefile space and lots of CPU time.
This issue can occur if the Indexing service is running on the computer. The Indexing service uses the Cidaemon.exe process to index files. The Cidaemon.exe process builds and updates the Index catalog. Additionally, the Cidaemon.exe process typically uses lots of pagefile space and lots of CPU time.

To resolve the issue, turn off the Indexing service. To turn off the Indexing service, follow these steps:
1. Double-click My Computer, point to Explorer Bar on the View menu, and then click Search.
2. Click Change preferences, and then click Without Indexing Service.
3. Click No, do not enable Indexing Service, and then click OK.

Now, in addition to cauzomb's suggestions about TeaTimer...right on by the way. TURN IT OFF
I would also suggest that you UNINSTALL AdAware 2007.
It runs all the time as a service for one thing so it is using up valuable memory. I personally don't care for this new edition. I just don't feel it is as good as AdAwareSE.
For additional protection I recommend you use the FREE program, SpywareBlaster from Javacool. It DOESN'T run in the background but offers superb protection against ActiveX-based spyware, adware, browser hijackers, dialers and also offers a Restricted Site protection for IE.
Here are auto starts and an explanation of what they are, that you can safely turn off, all will run manually if needed;
NvCplDaemon>>>This program is not required to start automatically as you can run it when you need to. It is advised that you disable this program so that it does not take up necessary resources.
nwiz>>>This program is not required to start automatically as you can run it when you need to. It is advised that you disable this program so that it does not take up necessary resources.
mDNSResponder.exe>>>> The Bonjour Service is typically installed with the iTunes software. Apple's site describes: "Bonjour, also known as zero-configuration networking.
This program is not required to start automatically as you can run it when you need to. It is advised that you disable this program so that it does not take up necessary resources.
IDriverT.exe>>> Program associated with InstallShield. This startup should only be created when a software that uses installshield is being installed. If you are not in the middle of installing a program, you can disable this entry.
An easy way to turn all of these off is to use Mike Lin's Start Up Control Panel

I would also suggest that you go to Crucial
and do a quick scan of your computer and see how much RAM you can add. I would recommend adding another 512MB. RAM is cheap and crucial is a good place to buy it. Just plug it in and you are good to go.
I would suggest doing all of the steps recommended by cauzomb, and disabling those unnecessary starts. Plus, REBOOT the computer because this should release some of that memory back.
Judy