Output error

When I go to test a movie i get this in the output window,
Error opening URL “file:///blahblah/filelocation/blahblah.swf”

Why is this? Sometimes it will work if I take one of the flas out of its folder and relocate to my desktop.
Something with my flash player?
this sux
any help please

I dont really understand what u mean Voetsjoeba, please bare with me.
When I am working on fla’s and want to see if they work, I go to test movie to see how it looks. This works great. So say Im done working and I quit flash, if I move that fla I was originally working on into a different area (folder) and then open it in flash and try to test it , I get the error message.
weird.