Question: why did my computer do this?
Answer: sometimes another user on the computer may ACCIDENTALLY set a password, or may be thinks its a funny joke. there are also malicious chat users and web page makers who can send a line of code/ or place a line of code on a web page, and a simple click from you, will accept the changes. This was a problem with an older 5.0 version of yahoo messenger, as well as forced file downloads, and embedded pics.
When you have completed this fix, virus scan at one of the free online scanners. And update whatever scanner you have on your computer ( JUST IN CASE!!)
TIP! this page will not be accessible if you ever get the content advisor warning. it is one of the pages you should save in favorites as being able to view offline, OR click on file, save as.. and save it to your harddrive or to a floppy... IF you do that, i strongly recommend also saving the
other page with the program as well ! and the PROGRAM!!
this way you have the information handy if you should ever need it.
Later... Make a point to back up your registry once every few months or so as well ~ learn how here