Ihave made a couple of movies already and it went well now the one I ve completed won't save to burn it always quits at 90%

You do realise we're going to need a LOT more information than that before we can even venture a guess?

It's says that I don't have a enough memory or it sometime says to try use a lower resolution I don't understand how to do this I didn't have a problem with the other ones I did and this one is not as long would I be better off to earse the windows movie maker from my program and reinstall it and start again or do I have to change settings in my computer I'm kind of computer iliterate

How much Computer RAM do you have installed... and how much free hard drive space do you have? Its giving you a good indication when it tells you that you don't have enough memory. One of those two things will likely be the reason.

I will have to look when I get home but the computer is brand new so I shou ld have lots of space I haven't done a whole bunch on it just use it for pictures and my video camera how do I find out how much ram I have

Under XP... Start/settings/control panel/ system It should be on the first General information page. It will tell you the CPU speed and how much ram you have. On a new computer unless you have downloaded a LOT of stuff, you should have a lot of free HD space.