OK, I'll bite.  What can I do?

My colleague, GA Researcher cynthia-ga asked me to post this
comment for her, as for some reason she's unable:

Readers, reference: 
http://answers.google.com/answers/threadview?id=608006
I'm dying to see the answer...

If you susupect someone else has your financial authentication data get
it changed (may require a phone cal to the banks or a visit to their websites).

Also get a statement of recent activity and challenge anything you
don't recognise.   Also confirm that all account details - including
your address and email addresses - are unchanged.

Now the harder problem - what if someone in the shop changed something on your PC?
For all you know your passwords could be captured when you type them
and be emailed to someone.  Unless you prepared beforehand with some
sort of record of your drive the only sure thing to do is a complete
reinstall.  You might think that's too drastic unless you see signs of
interference.

This is not the answer you're looking for, this is a workaround,
hence, I'm not posting this information as an official answer. I'm
hoping someone will answer it so I can protect myself too!

What I do, is this:

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1) I repair my own computer. I learned how here:

VirtualDr.com
http://www.virtualdr.com

I recommended the site in a comment at this question:

Subject: a free website in teaching pc repair cost free 
http://answers.google.com/answers/threadview?id=603437
Read the comment to see how they can help you learn to repair your own computer.

**********************************************************

2) I also use a keylogger that records ALL keystrokes and ALL activity
on my computer by all users. I use this one:

SC Keylogger Pro (there is a free version that does not run in stealth)
http://www.soft-central.net/keylogger/pro.php

The keylogger just keeps honest people honest, it won't stop thieves.
I review the log files periodically to determine if people are looking
at things they should not be accessing. When they do, I show them the
log file and tell them to stop. It's very effective.

In your case, if you had this installed, you wouldn't have to wonder
what these folks did on your computer, it would show every single move
they made, every file accessed, every keystroke.

**********************************************************

Like I said, this is a workaround, not the way to protect yourself.
I'm hoping for an answer as much as you are.

~~Cynthia

My dear you can try secret explorer


 It is a shareware but it will show you the first two letters  .

If you can make an educated guess thats it you have done it