Hi Bexlee
well nothing "seems" wrong with your PC apart from low RAM, and maybe your cpu is abit slow.... Can you not add more RAM and try that?
I'm not saying that that will fix the problem, but its worth a try.
If your PC uses pc 100 or pc 66 RAM then you can buy very cheaply.
You can get it online from here... Just find your motherboard and it will tell you what RAM you need.
http://www.crucial.com/
Your HD's are both fast enough, 7200rpm is as fast as you can get on an IDE port.
This is just a standard warning message. It may have nothing to do with your HD's.
: 'Sorry cannot capture. The data rate on drive D: is less than the required rate of 4444 kbyte/second.'
Can you load other software to your new HD? If so, does it run ok?
One thing you could try, is swap PM with PS and see what happens. WARNING, this could stop your PC from booting, and I do not take any responsibilty if something goes wrong......
If your PC does not boot or the problem is not fixed, then swap them back.
If none of this helps, then it's time of a new PC