Tweaking guide: How to speed up my PC for free ?

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Based on feedback I get, it looks like PC performance is a major issue for many readers. This 5 step guide will help you to speed up your PC in minutes. Tips and tweaks provided are applicable to Windows XP and Windows Vista (unless else specified). I highly recommend that you use the following tips as your initial performance activity list when troubleshooting a PC performance issue.
Minimize the number of programs that run on startup
From time to time we install new software our PC. Some of those programs will run automatically when we turn on our PC (startup), causing a major degradation in our PC boot time and overall system performance. Moreover, spyware, adware and even malware (virus, trojans) might run on startup making your PC crawl. The Microsoft Windows System Configuration Utility (aka MsConfig) is a powerful tool that allows to select what programs will run automatically by default.
Usage is relatively simple:
1.Click the Start button2.Vista Users: In the start search type msconfig and click Enter . XP Users: Click Run, then type msconfig and click Enter.3.Navigate to the Startup folder4.Uncheck any program you don’t want to run by default. Note: Make sure you don’t disable Microsoft programs.5.Click OK6.Reboot your system
Adjust your System Performance Options
Windows operating systems feature a constant tradeoff between visualization richness and system performance. The “prettier” you system look, the more it consumes its resources and thus the more likely is to start crawling and consequently affects your productivity
Both Windows XP’s and Vista’s basic configuration is optimized for best appearance. However if you set Windows to optimize performance, you’ll loose some (insignificant?) visual effects, such as the 3d toolbar, shadowed menus etc’, but you gain a lot in system performance.
Here’s how you can do it:
1.Click the Windows Start button2.Right click Computer3.Click Properties4.Go to the Advanced tab5.In the Performance section, Click Settings6.Check the Adjust for Best Performance button Note: If you really want to display some of the advanced visual effects Windows offers, you should click Custom and select the required effects .Click OK .
Defragment your hard disk.
Defragmentation increases the speed your hard disk reads and writes information, thus improving your overall system performance. Therefore, it’s a good practice to defragment your hard disk partitions periodically (i would say, once in 2 weeks).
Here’s how to defragment your drive:
1.Click the Windows Start button2.Right click Computer3.Click Explore4.Right Click each of your partitions (C, D etc’)5.Click Properties6.Navigate to the Tools tab7.Click Defragment Now8.Here you can schedule a Disk Defragmentation job or launch an immediate defragmentation job.