How do I make my machine run faster?
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First step is to make sure you have adequate RAM. (You do) For XP and Vista 2 GB of RAM is recommended.
Sweep your machine clean of viruses and spyware
Run Microsoft Disk Clean Up (All Programs > Accessories > System Tools)
Then, reduce the number of processes that it runs at startup - scanners, toolbars, automatic updating things, IM clients, whatever. Everything that runs in the background makes your machine a bit slower. Delete the c**pware that comes from the computer manufacturer that you never use. A small program, PCDecrapifier http://www.pcdecrapifier.com/ can help in removing the excess programs that manufacturers load your hard drive up with.
To change Startup programs, use the System Configuration utility. Control Panel > Classic View > Administrative Tools > System Configuration utility
Or, get the Autoruns program (free) to turn off startup items http://technet.microsoft.com/en-us/sysinternals/bb963902.aspx
In Vista, Control Panel > Programs > click Change startup programs.
Remember that Windows needs a bunch of different startup resources, so don't delete them unless you know what they are. Research them here http://www.windowsstartup.com/wso/search.php
Turn off the eye-candy, the interface shadows and zooms. Set your Control panel for maximum performance.
Make sure your operating system, video and motherboard drivers, and system software are up to date.
Clean out caches with CCleaner http://www.ccleaner.com
Glary Utilities: http://www.glaryutilities.com/
Delete old programs that you never use.
Use Task Manager (Control Alt Del) to see what processes are running on your machine and what's taking up processor power.
If your hard drive is nearly full, either delete a bunch of stuff and defragment, or consider upgrading to a new larger, faster hard drive. Hard drives slow down dramatically as they fill up,
http://www.extremetech.com/article2/0,1558,5155,00.asp
http://www.microsoft.com/atwork/getstarted/speed.mspx
http://www.microsoft.com/windowsxp/using/setup/maintain/improveperf.mspx
http://www.microsoft.com/windowsxp/using/setup/expert/northrup_restoreperf.mspx
http://windowshelp.microsoft.com/Windows/en-US/help/83ec0ffe-ee04-4d53-8b87-25d1f05c954e1033.mspx
If none of this works, consider backing up your data and reinstalling Windows. This will mean reinstalling all of your programs from their original disks, and reapplying updates, so it is a chunk of work, but it can result in speed gains on systems that have been running and accumulating junk for a long time
To reformat a machine requires that you have the original Windows disk or the Restore disk that came with your machine, or that you have a machine with the restore files in a hidden partition. Contact your machine's manufacturer if you do not have restore disks.