Okay, I'm a techie novice and I haven't a clue whats up with my compo - am very much hoping that one of you will though!

I can open .pdf files that I already have saved in my computer but ANY .pdf file that I try to download from the web doesn't/won't/refuses to open. All that is showning on the screen is a little square with a red square, green triangle and blue circle.

I never used to have this problem until recently and can't think what I might have done to caused it.

Please, please, help

Mags