How do I make my machine run faster?
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First step is to make sure you have adequate RAM. For XP and Vista 2 GB of RAM is recommended.
Sweep your machine clean of viruses and spyware
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.
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.
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
Run Microsoft Disk Clean Up (All Programs > Accessories > System Tools)
Delete old programs that you never use.
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