Here is a collection of tips and tricks that I put together after years of experience in computer maintenance and repair. This is for anybody who is looking for new solutions and techniques to do more with your existing hardware and save your valuable time and money.
Beware that editing the registry of a computer is a sensitive job which if it is not done right, can cripple a pc or completely damage the operating system.
I have tested all of these on Windows XP-Professional but you may run them on your own risk and I do not accept any responsibility of any sort of damage or malfunctioning in your computer!

1. Speed up and protect your computer
    

2. Add hibernate icon to Windows XP shutdown menu
   
   
   
   Normally, there is no 'Hibernate' button in computer's shut down menu. You can simply download this small registry piece and run it which will add the button to the shut down menu.
    
3. Change the listening port for Remote Desktop
    
4. Multiple simultaneous Remote Desktop Sessions in Windows XP Professional

Do it at your own risk!

STEP 1
Start your Windows in Safe Mode (tap on F8 before Windows Loading Splash Screen) --> right click on “My Computer” and click on “Properties” --> go to “Remote” tab and uncheck “Allow users to connect remotely to this computer” --> click OK.

STEP 2
Go to Start --> Settings --> Control Panel; open “Administrative Tools” and then “Services”; --> double click on “Terminal Services”; --> choose “Disabled” for “Startup Type” option; --> click OK.

STEP 3
Go to C:\windows\system32\dllcache; --> rename the termsrv.dll file to termsrv.old or another name you like; Copy and paste termsrv.dll to that folder; --> go to C:\windows\system32 (the upper folder of the current one)

do the same operation: rename termserv.dll also here, and put another copy of the file I linked above.

STEP 4
Click Start, --> “Run…”, type “regedit” (without quotes) and press ENTER --> Go to this path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core;
Click on "Edit", choose “New” > DWORD,
Name the new key “EnableConcurrentSessions” (without quotes), then edit it and set its value to 1;
Close the editor.

STEP 5
Click Start, --> “Run”, type “gpedit.msc” (without quotes) and press ENTER;
Open Computer Configuration --> Administrative Templates --> Windows Components --> Terminal Services
Double click on “Limit number of connections”
Choose “Enabled” and set the maximum number of concurrent connections as needed to allow (2 or more), then Restart Windows in normal mode.

STEP 6
Go back to Remote tab of My Computer’s properties and activate “Allow users to connect remotely to this computer”;
Go back to “Terminal services” in “Services” and set its “Startup type” to “Manual”
Finally restart Windows. Your operating system should be ready to accept multiple remote desktop connections.
The list of users that can connect to the PC is editable in the remote tab of My computer.

4. Does your internal hard drive show up in removable area? That is crazy!
   If you have a Nforce4 Based Motherboard and your sata drives are showing up in Safely Remove Hardware, this registry change will allow you to fix it.
   
   1. Click Start --> Run
   2. Type regedit and hit "Enter"
   3. Navigate to  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\nvata
   4. Click Edit and Select New > DWORD value
   5. Name this DWORD: DisableRemovable
   6. Double click this new DWORD and set its value to one (1).
   7. Close Regedit and reboot
    
5. SP3 installation problem on non-intel CPUs
   Before upgrading you Windows Xp to SP3 you have to make sure that your computer is ready for it!
   - Right click on "My Computer" and click on "Properties"
   - There you can see what kind of CPU your computer has, Intel or AMD
   - If it is Intel you are ready to install SP3 but if it is AMD you can download this little gadget to make it ready.
    
6. Windows XP product key change
   If you lose your Windows XP installation CD don't panic! Here is a simple solution.
   You can use an installation CD that belongs to a different computer but only make sure it is the same operation system that your computer used to have. If it was Windows XP Home Edition, you have to find a CD that belongs to another computer with Windows XP home Edition and so forth.
   1. Use the matching CD and install it on your laptop or desktop
   2. Write down your original Windows "Product key". You can find it if look around the computer case for a label or logo that looks like this:
   
   3. Download this small gadget to change your computer's key to what it is on the label.
   4. Restart your computer.
    
7. Windows XP registration name change
   If you buy a used computer or some one gives you his/her used computer, it is already registered to a different owner. You can change the registered owner's name, using this software.
   Run this software and go to "Options" and click on "Change Windows Reg Info".
    
8. Device drivers for most popular UPSs in the market
   APC
   CyberPower   
   
9. Microsoft Fix it Solution Center
   Find automated solutions for your computer issues.
       

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