If you have some sort of software that you accidentally hit a setting on, that caused this, then identifying that software and changing the setting is the only thing that will work.
But, if this is an issue due to a malicious attack on your machine, then you can solve it by doing the following:
First, (and do it first cuz you don’t wanna wipe out what you do after this) do a system restore to a time when you did not have this problem. That may or may not fix your symptoms. Then, after that, whether or not the symptoms are fixed,
download and install the following:
ccleaner http://www.piriform.com/ccleaner
spybot search & destroy http://www.safer-networking.org/en/download/
malwarebytes anti-malware http://www.malwarebytes.org/mbam.php
Run the free but full versions of each of these programs, but do it separately of course, always.
This is assuming you’ve already done an anti-virus scan. If you haven’t, then do that too.
Then after that, download Picasa from www.picasa.google.com , and install and run that. This will tell you where in your hard drive every single image is. You can then delete any you don’t want.
To check if a suspicious program is running, you can sometimes (but not always) find it as a running process. Go into Task Manager and see what’s up.