See Norms posts here -
http://www.annoyances.org/exec/forum/winxp/t1029715523
"Had this problem, here is what I did:
Open regedit, go to:
HKLM_SOFTWARE_MICROSOFT_WINDOWS_CURRENT VERSION_RUN
If you have a logitech input device, or a Gravis gamepad input device, you need to
modify the value of the registry key so that the application starts up in *belownormal*
processor priority.
Example:
start /belownormal c:\windows\system32\Grxp4exe.exe /init
"start /belownormal" is the addition you will make to the beginning of the line..."
You`ll have to read the thread to find the exact keys you need.
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You seem to have a lot of things starting with Windows.
If you go into msconfig startup tab and uncheck everything
except firewall/AV/antispyware you might find that your computer runs better.