- Check if there are programs that runs automatically when Windows 7 starts up. This may affect your computer performance. Click start/ run and type "msconfig". Press enter. Look for the list of startup programs. Remove those programs that you don't want to run on startup.
Clean the windows registry. You can download registry cleaners for Windows 7 on the internet.
Download and install the Process Explorer a software which is a part of the Microsoft SysInternals package. This program will help you identify the programs running on your computer. Remove the program by right clicking it, and then select "KILL". This program works just like the Task Manager, but gives you more information and has a better design.
After doing all these three methods, the Windows 7 slow down problem should be solved.