|Deleting old files could help in some cases. If you insist one can use tools like task manager or performance manager to get an idea as to what is causing the slowness. |
I tend to suggest to people that if it was fast when new then consider returning it to the OEM state. It is a good task to master also.
Poorly written applications, power shutdowns, maleware and spyware and too many unused programs tend to slow down computers. It is not easy to clean it all off piece by piece. A reload with the original media and add in service packs and add in something like microsoft security essentials or other app then see how it works.
"The era of big government is over," said Clinton 1996