>I have downloaded and installed Service Pack 3 for VFP6. Since then my applications that I developed in VFP6 act strangely to say the least. Has anybody else encountered this problem? Is there a fix? What did I miss?

A fix for what? "Acting strangely" isn't giving us very much to go on.

>Also, the computers that are running off of mine are no longer able to run VFP, error message: missing support library. Which files should I be installing on them?

You might want to create a new install exe from the setup wizard and run it on all machines that use your new exes. This will ensure that they have the latest runtime versions.