a couple of things.
go to msconfig and disable some unnecessary startup applications running in the background.
Start -> Run -> type in "msconfig" -> go to the start tap.
Use "disk cleanup". Rightclick on your C drive and hit properties. Click on Disk cleanup.
Use it to remove useless files (including files located in the recycle bin). A harddrive reads slower on the outer edge of the disk, that's why the harddrisk (and CD's for that matter) always start putting the files as close to center as possible.
Defrag your Harddrive.
Start -> Accessories -> system tools -> disk defragmenter
It will rearrange the files for faster access.
---------- Post added at 12:54 AM ---------- Previous post was at 12:49 AM ----------
you might not see huge difference.
harddrives gets older when used and they will slow down over time.
Also the OS gets more heavy when more stuff is installed in the registry and and windows folder.
A reinstall might be the best option if you have had the system running for a long time.
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