Hi Sarah.This picture manager is very unusual,as it copies every image you view on the net.
We have to disable it.
First open Picture Manager,select tools and uncheck every File association Box.
I haven't the program,but must have OK or Apply or similar, at the bottom.
Then read this from Microsoft, and set all like files, to open with another Viewer you have.
Like windows Picture and Fax viewer, for example.
Link.
How to change or select which program starts when you double-click a file in Windows XP
Hope this Helps.