Two things need mentioning,

1) Do not stop Prime95 when it is doing any phase of P-1. It will always start over. P-1 MUST be completed to continue.

2) Prime95 runs at a very low priority. It conflicts with Outlook, Outlook Express and Word. When these programs are running, Prime95 gets very little CPU. Also, disable "Find Fast". It takes a lot of CPU.

If you don't want to do much P-1, leave your memory usage at 8MB.