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Now I just have to make up my mind about buying a new computer.
There are a lot of advantages and some disadvantages if you take this route. A little research is necessary to make sure there are not too many. With a new computer you will absolutely find an increase in speed, a 5 year old computer with less than a gig of memory is by default slower. You will probably get 1-2GB of Ram and it will be the latest and fastest available today. The CPU will be faster, you get bigger and faster hard drive and probably a combo CD/DVD writer thats faster than what you had. A big plus will also be the monitor, most system come with a flat panel and a faster video card.
The down sides will of course be the OS, Vista. You will need to learn the differences (not that hard actually), and then find out what software and hardware is not going to work. You either upgrade them or learn to live without them or get a replacement that works under Vista.
I usually tend to suggest that folks go with a new PC, memory upgrades are good but they usually don't give you the speed increase you really want to see. They give some but not what you will see in a new PC. And its always exciting looking at new PC's and bringing one home and plugging it in and turning it on