Northwoods were know to run cooler than Prescotts but the Prescott should have given you a better WEI score
make sure all unnecessary programs and processes are turned off while running WEI
with that said
your video playing will be more dependent on a video card than the CPU
getting a decent video card would definitley help the video
I ran a Dual Xeon Pentium 4 based system for years and using a Nvidia 7600GS AGP card really helped with the video
the only problem is that your system is more than likely AGP and those cards are expensive to buy from online now
and to be honest investing money into your system is just not worthwhile
not to be mean
so if Craigslist is available for you or some other used option then please buy the card used
if you need help open up a thread in the Graphics forum and we can help you figure out what video card (GPU) you need
also be warned there are some immature members on here who will pick on you for having an older system sorry to say
so just ignore them
you can also private message me by clicking on my avatar picture and send me the link to the Graphics thread so I can help
first make sure what kind of video slot you have
either PCI,AGP or PCIe
if your not sure list your motherboard (mobo) model number and I can help