computer

I have two questions. I have a Fujitsu siemens
540@1.86ghz 504mb ram. I know that I need to increase the ram and I purchased 1gig. First what should i set the page file to. please give me the min and the max for one Gig ram. This may be part of my problem, I have slow computer slower than it was before. How can I get some speed back. I defrag the hard but the windows and the internet takes seems like days to load. I have cable at 10 meg speed. The tech from the cable company say its the computer. Ran antivirus and found nothing. When I close windows it jumps its way down the sreen rather than smothly closing.