Some random tricks to try
Sourced from this site
This is a rather nice trick to try . First go to Google Images and type anything you want to search - dogs, sticks, prons etc .
Then clear the address bar and paste the following in
There are other varations to try out too . See Here
Changing Vists Bubbles
If you have Vista you may want to look at this
Changing Vista Bubbles Screensaver
One thing i found was that when renanimg the file, best to rename it something other than bubbles.htm, e.g mubbles.htm
Eicar Test File
You may have done this before.
Copy and past the above into notepad , save as 'eicar' , and scan with you anti-virus. It should be detected. see more on The Wiki Page