I cant take off the screw to replace the main memory (under the keyboard)?

What system?

http://support.dell.com/support/edocs/systems/ins700m/en/SM/upgrades.htm#wp1108224

Don't force it.

What do you mean you can't unscrew it?

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@chitranukroh wrote:

I cant unscrew ti because it is way way too tight  :-(

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Do you have a good screwdriver that fits it well (correctly)?

I actually had a hard time unscrewing one screw on the bottom on the 700m. One came off nice, while the other one was a pain. I actually stripped the head, and want a new one. Is it possible to get a new screw from dell? Probably lame, one screw, probably pick one up at Home Depot, lol. Anyway, yeah, try to get a screw driver that fits well. If you start to strip the screw head (destroy the grooves), then try a flat head. That is what I had to end up using.