1. A physical clean of the system including fans and heat sinks and replacement heat-paste if required.
2. A check of all the hardware components.
3. Defragmentation of the hard drive.
4. Temporary files cleared.
5. Registry entries cleaned.
6. Unnecessary programs removed from startup.
7. Virus and spyware removed.
8. Minor hard drive errors corrected.
9. Windows updates applied.
10. Recommendation of any hardware replacements/upgrades if required.