No, you did nothing wrong, it is just that I for one could not figure out any account-specific causes of your situation... sorry.
A roundabout way out would be to create a new account for yourself and migrate over to it all the files from your old My Documents folder. Before you do that, you could try restoring your sys to a date before the problem was first noticed.
I'm a bit curious, though, it is likely to be some toolbar or other add-on of yours, like Google Desktop, so...
==download hijackthis: http://www.majorgeeks.com/download5554.html
-copy it to a new folder either alongside your program files or on your desktop.
-in that folder start HijackThis by dclicking the .exe; now close ALL other applications and any open windows including the explorer window containing HijackThis.
-click the Scan and Save a Logfile button. Post the log here.