When the process is running, go to the task manager, right click on the program, click "go to process," right click on the process, go to select priority, and check off "high." If you check off "realtime" you run a very good chance of having your system lock up completely. Don't do it.
You also need to know that not all applications are made to take advantage of multiple processor cores, and are consequently not able to use up that much processor time. You also need to consider that the application will only use as much RAM/CPU as it absolutely needs. You can't force the application to use more resources just to get something done faster. Think about it like this:
When you're driving, your car only uses as much gas as it needs. If you drive very fast, your car sucks up gas faster. What you're essentially asking is for your car to use as much gas as it would to go 100mph just to go 20mph. It doesn't work that way.