MY WHOLE COMPUTER IS LAGGING

A couple of days ago, my video chat on iChat started lagging as in freezing every 5-10 seconds and then coming back again. now, this has been happening with my whole computer and my safari and everything i do stops every 3-5 seconds for about 5-10 seconds and then comes back. Will somebody please help me because this is very annoying.

Hi there, 1st off how much free space on your Hard Drive?
At this point I think you should get Applejack...
http://www.versiontracker.com/dyn/moreinfo/macosx/19596
After installing, reboot holding down CMD+s, (+s), then when the DOS like prompt shows, type in...
applejack AUTO
Then let it do all 5 of it's things.
At least it'll eliminate some questions if it doesn't fix it.
The 5 things it does are...
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.

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