Okay -- for you computer geniuses of which I know there are many on this site:

I'm packing my desk -- today is my last day at work -- and I was clearing everything off my computer when I realized just logging out on this forum and others just takes the cookies out temporarily....my former boss is taking my computer and she's a nutjob and I don't want her to be able to start typing where it fills in the rest of the screenname and the password...so here's my question:

is there any kind of thing I can run to clear these cookie things out for good on this computer?

also is there anything I can do so that they can't even tell what websites I used to go into? like maybe possibly accidently/on purpose wiping out internet explorer from the computer?

Please -- whoever answers -- I'm a computer spas/illiterate if you can't already tell...please "speak" slowly and have mercy...Thanks!!