2. This usually governs when is a good time to buy a new PC. The fact is that a umpteen year old computer just can not run modern programs fast. Overtime even the opperating system itself requires more resources to run. Example being orignal XP against XP SP3 where a whole lot of new programs and features were added which needed more resources. Although you will never get your feeling of perfect responsiveness back, you might be able to boost performance by installing more or larger memory modules (more RAM).