For those of us running lots of applications, RAM utilization can be a big deal. Likewise, it is often helpful to know just what processes are being run, and—even better—being able to quickly and easily stop them. Here is a great open source free way to do both of these tasks: Process Hacker.
Another program you might look at is WinPatrol.
It may turn out that you need more RAM. In that case, try using Crucial's System Scanner Tool.