Originally Posted by Richard Cranium
Try looking in Applications Menu -> Settings -> Sessions and Startup -> Session. If you see gkrellm in the list, click on it and then click the "Quit Program" button.
That was one place I didn't think to look. That probably was it too. I'll reinstall GkrellM and make sure it is not there. Thanks.
I must have already compiled and installed GKrellM on my computer not realizing that it was already installed as a Slackware package. Since I had uninstalled the Slackware package, I was not expecting GkrellM to come up, but it did. I found out that it was XFCE's saved sessions that was starting it in the first place, so I had it removed from there. Now it isn't comming up anymore.