Improve system performance speed

1. Remove spyware, and help protect your computer from viruses
2.Use Disk Cleanup to:
    *Remove temporary Internet files.
    *Delete downloaded program files, such as Microsoft ActiveX controls and Java applets.
    *Empty the Recycle Bin.
    *Remove Windows temporary files, such as error reports.
    *Delete optional Windows components that you don't use.
    *Delete installed programs that you no longer use.
    *Remove unused restore points and shadow copies from System Restore.
3.running Disk Cleanup and Disk Defragmenter to optimize the performance of your computer
4.updating to Windows 7