Hmmm... well I just saw a review at CNET(couldn't find the specs on dell's site) and apperently 512mb is the max it can hold.
You can try making a bigger paging file (virtual memory)
Go to my computer, right click it, select properties and then select the advanced tab.
under that tab click the first one, should be performance, and then the advanced tab uner the performace options menu.
At the bottom it should say virtual memory, click change.
Here's the kinda difficult part. If you have 5-10Gigs of space free on your harddrive you should be fine, so click custom size and change it to something like 'inital size' and type something like 512mb and for max size 1512 or something. Try playing with that increassing the virtual memory and see if it improves performance. Next time, shop around and don't buy a dell.
Hope that helped any.
ugg.. lol that had to be the worst written paragraph I've ever written. If it's not clear enuff tell me and I'll try again.