Speed Up Your Slow Computer and Make it Last
repair tool”>Defragment your hard drive. This is especially important if you just deleted some large files. On a Windows computer, go to the Start menu, All Programs, Accessories, System Tools, Disk Fragmenter. It is like shaking the bag of chips to make them settle at the bottom.
Make sure that you have a spyware blocker and anti-virus installed and running. Multiple spyware programs and/or viruses will certainly slow your computer by hogging CPU cycles, memory, and hard drive space. Most companies use the name Internet Security to bundle a spyware blocker, spam blocker, and anti-virus, and it is worth it to get one from a well-known company that updates its list of dangers regularly.
You might have skipped the last paragraph because you already have a spyware blocker installed, but make sure that it is working. Do you see the icon in the system tray (lower right