No and no. The days of a CPU without a math coprocessor ended with the 486. I don't know where you got the idea that you didn't have a coprocessor, but I wouldn't go back there again.
And registry programs are prone to causing more problems than they ever resolve, which isn't difficult since they don't resolve any issues at all... They do cause problems though. They are best avoided.
I'm running XP my ram is maxed out on a HP 7935 would adding a coprocessor help this problem or would a good registry cleaner accomplish this?