If it's a SATA hard drive, they may, or may not be necessary.. In addition, although everything you've listed looks like a good starting point, I have noticed that Intel has a newer IDE/Chipset driver.. After installing the one you've listed, you might visit the Intel site and use the newest one.. I found the new one corrected a few blue screen issues on the HP downgrades I've performed..

Of course, since you didn't list the model number for your Gateway, it's a little tough to make any further guesses.

Hope this helps.

Grif