If it says "command not found/file not found" when you try to run a shell script, it means that you simply do not have that shell installed. If you're using Caldera OpenLinux 2.x, then you'll run into that problem. Caldera OpenLinux is a bit goofy to say the least.
Anyway, I'm sure that script's first line is:
#!/bin/sh
and I'm also sure that you don't have the sh shell installed. I am pretty sure that you have bash installed though... So, log in as root, and make a symbolic link called "sh" to the file "bash".
The command "ln -s bash sh" wil create a symbolic link named "sh" pointing to the file "bash" when executed from the /bin/ directory (do a "cd /bin" before doing this). Oh, and you have to do this as root.
With regards to your video problems, have you tried xvidtune? Use it with caution, though. xf86config can also help you solve your mouse problem.
A quick look through the HOWTOs at
www.tldp.org will definitely prove fruitful for all of your problems.
Good luck!