Does any of your your older applications have trouble running on your new system, with dual or multiple processors? Do you find such older application maximizing the CPU usage at 100 percent?

You can get around these problems by setting processor affinity for such older applications.Configure the older applications that are not multiprocessor (SMP or HT) aware to use only one of the CPUs (processor), by setting processor affinity in windows task manager of your windows vista operating system.