It would help if you told the folks here what your computer specifications are.

You could also try the below FREE programs with different Data bases.

You can  get FREE program called Spybot from;
http://spybot.eon.net.au/
If you install with Blind Icons you also get extra Immunize Options
"Lock IE Home Page"
"Lock Hosts file"
"Lock use of Internet Options from IE" > Tools > Internet Options

Use Update 1st before Immunize & Scan for problems & delete files shown in Red or Green & auto ticked.
Also has other Tools , like list or Add/Remove of Auto Startup Programs & lists Hosts file

If you have already install Spybot & Immunize doesn't show extra option
change the Shortcut link "Target" to
"C:\Program Files\Spybot - Search & Destroy\SpybotSD.exe"
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You can also get FREE Programs called Ad-ware from;
http://www.lavasoftusa.com/software/adaware/
Update program 1st before Scan.
Delete links for "Data Miner"

As both programs have a different Data base use both.

Also, try deleting your temporary internet files.

Also, you could clear your prefetch (folder); after time that does get clogged. There's also a registry setting you could change (ie from 3 to 2) so as to not clog up that folder. 

the specs for this comp are:

 

Dell Dimension 2400 Desktop

Windows XP home edition

dial-up modem 56 k

2.2 Ghz 128MB 40 GB

and it has a NTSF thingie

 

i'm sorry i'm a little computer illiterate

was your computer faster before?
If not then get more RAM.
128 is not too much and once its full it gets s l o w.
RAM is cheap and helps a lot.