Try closing un-needed background programs or running the application on a different memory bank to the other programs. Assuming that your 1gig of RAM is installed by using 2 seperate 512meg banks, then go into 'Task Manger,' by pressing ctrl, alt and delete, then click on the processes tab. Right-click on the process name and then set afinity.
I have never actually used this but I hear that this is what it does.