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Many friends have asked me about this, “Why does my PC/laptop seems so laggy and overload to such slow performance?”. According to my own technical experience on helping others to reformat their PC/laptop, hopefully this will help you prevent this, make sure you have all these steps in your regular habit when using your own PC/laptop:

1. Empty the Temp directory regularly. To do this, make sure NO programs are open,

• In Windows 95, 98 or Me, go to C:\Windows\Temp and delete everything inside the Temp folder.
• In Windows 2000 or XP, make sure that you can see “hidden folders”. Go to C:\Documents and Settings\Administrator\Local Settings\Temp folder. Delete everything here.

2. Empty the Temporary Internet Files regularly.

• Go to Control Panel and doubleclick the Internet Options icon. Choose to Delete Cookies, and Delete Files.

3. Check your hard disks for problems.

• For Windows 95, 98, or Me, double-click My Computer. Right-click the C-drive and click on Properties. Click on the Tools tab and choose to check the computer for problems.
• For Windows 2000 and XP, double-click My Computer. Right-click the C-drive and click Properties. Click on the Tools tab and choose to check the computer for problems. Click on Check Now.

4. Download a good 3rd Party Disk Check and Optimization Utility

• TuneXP

CAUTION: This registry tweak is to to force Windows to keep its operating data in main memory

5. Do a few of the performance tweaks yourself for Windows XP

• Right-click on My Computer > Properties > Advanced tab. Under Performance section > Settings. Go Advanced tab, under Virtual Memory section, click Change. Now it’s the time for you to set your own Initial size(MB) because by variety settings here. Tips: Set as highest as you want but don’t make it too high as it will overload your system.
  e.g. if my Maximum size(MB) = 3840, I would rather change my Initial size(MB) to 3000 ~ 3200.
  Click SET when you’re done.
• Click “Start” > Run, enter regedit
  Navigate to HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\Memory Management.
  Double-click the DisablePagingExecutive value to ‘1′
• Click “Start” > Run, enter regedit
  Navigate to HKEY_CURRENT_USER\Control Panel\Desktop
  Double-click the MenuShowDelay value to ‘0′
• Click “Start” > Run, enter regedit
  Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
  Create a new key named ‘AlwaysUnloadDLL’ and set the default value to equal ‘1.’
• In addition, for those who think the performance of your system still not in good condition.
  Right-click on My Computer > Properties > Advanced tab. Under Performance section > Settings > Virtual Effects > (You really don?t need any of them for Windows to run) so checkbox adjust for the best performance. Then you’re done.
  But your windows appearance may change into classic windows, indeed it has the best performance meet your requirement.

6. Turn off Active Desktop and Screen Savers

• For Windows 95, 98 and Me, right-click on the Desktop > Active Desktop. Inside that option, uncheck Active Desktop
• For Windows XP, right-click on the Desktop > Properties > Desktop tab > choose Customize Desktop. Now, on the Web tab, make sure that there are no websites chosen here.

7. Use a good AntiVirus program, such as Norton, AVG AntiVirus.

• I’m using Norton Antivirus 2007, download here if you wish to have one too.
  NAV2007 or AVG Antivirus

8. Get rid of Spyware. Install two different AntiSpyware programs: AdAware SE and SpyBot (they compliment each other and catch Spyware that the other misses)

• Spybot-Search-Destroy
• Ad-Aware-SE-Personal-Edition

9. Streamline MSCONFIG.

• You can use a utility, called MSCONFIG, to turn OFF unnecessary Start Up items.
  Click on Start\Run and type msconfig. Click on the Startup tab. This is a list of everything that is running in the background. Now, becareful, some of these you do need. Some items to keep are Ctfmon.exe (XP), Scan Registry (Win98, Me), Task Monitor (Win98, Me), System Tray (Win98, Me), LoadPowerProfile (Win98, Me), Rundll.32, any AntiVirus programs (such as McAfee, Norton, or AVG). Others, you can uncheck. Remember, if something doesn?t work because you turned it off, it can always be turned back on.

10. Defragment your hard drives.

• To defragment your hard drives, double-click on My Computer. Right-click on the cdrive and click on Properties. Click on the Tools tab and choose to Defragment Now?

ADDITIONAL STEPS:
If you still unsure of what you are doing, there are softwares to assist you by doing some stuff.
Download Crap Cleaner or RegCure and run any after install
Download Advanced Optimizer and run it after install

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