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First, check the security of your passwords. Don't use ordinary words, dates, addresses: These can all, with patience, be guessed. Use difficult passwords that look like gruble673glorp or FzX783tL. Don't use the same password on all your accounts, especially not your online bank accounts, eBay, and PayPal!
Second, don't keep passwords in a file on your computer. If you must do that, encrypt the file. If you're using Windows XP, then set up different user accounts for different users ... and don't share that password!
Third, if you must share your computer account, then take these steps to make sure your web sites and web browser don't remember passwords. For instance, when you log on to this BBS, there's a checkbox called "Remember me". Log out. Uncheck that and log back in. Tell your web browser not to remember passwords. That would be under the browser's preferences somewhere. (I don't have them all memorized, so you'll have to look for the setting and turn it off.) Between web sites having the "Remember me" feature and web browsers being able to remember passwords, anyone using your computer could log into web sites as you.
Finally, if these steps don't solve the problem, then you have the fun task of looking for the keylogger in your Windows installation. That's not trivial to explain how to do, so try these other steps first and let us know how it goes.
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