>>1
Don't use that shit, it's stupid and will only make things slower by killing your poor system cache, and forcing Windows to swap out your applications and services.
You don't need to free memory in a real OS, free memory is wasted memory. The less free memory you have, the better you're exploiting it.
>>4
No, but "memory cleaners" are just bullshit from idiots for idiots (lol, writing this kind of tool without even understanding how a virtual memory system and a dynamic disk cache works), and
>>5 is right.
>>6
If your computer is sluggish:
1. Stop using Internet Explorer
2. Get rid of all the system tray bullshit you have
3. Quit all the fancy screensavers, desktop bars, Windows XP themes, and all that non-functional pure bullshit you have
4. Don't use resident antiviruses, use common sense and manually scan all new files (new files = downloads, friends' CDs, etc., not stuff you and you alone produce; no need to scan CDs twice and no need to scan CDs you burn after today)
5. Consider K-Meleon over Firefox, or just
www.opera.com
6. Set useless services to Manual, Google guide
7. Don't do stupid shit
If you follow this advice, 512 MB RAM will be far more than enough, even running Windows XP.