IIRC U r having an ancient system with a 700 Mhz proccy and low RAM.
1. Consider upgrading the system or atleast increase the amount of RAM.
(or)
1. Have adequate empty space in the root drive, so that the windows page file will be handled easily
2. Disable some visual effects
3. Disable some windows services that u don't use, like the 'Auto update', 'System restore', 'Remote assitance'
P.S: Why have u posted the same thread in two sections?