very important, please help

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Hi, this is my first post here. I have a problem, he is my cousin.
He came over during a party and spent some time alone with my laptop
computer. He is very computer savy, but not a very nice person. So
now I am afraid he has somehow gained access to my email account, like
he can read all of my mail from his computer. He comments on
transactions I have made, and should only be known to me. Is this
possible? He had his own CD's with him, so he could have loaded
anything to this laptop. If so, how do I find out what he has done
and how do I get rid of this problem? Thank you very much for any
advice. dan ps, all I can think of is to cancel my email account and
start anew.

.

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