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Block any installed application from lunching on your computer
Today tip will help you to block any windows built-in applications or other third party programs from being executed on a target computer. If you want to restrict an application from running your family members and co-workers then AppLocker provides a simple solution to do so. However this tip is very useful for you, if you are sharing your computer with others or you do not want that other persons run all installed applications. This trick will work in nearly all of the windows versions like windows 2000, XP, 2003 and 2008.
AppLocker provides us a complete solution to block any programs from being executed on a target computer. You can download this tool for any windows version using AppLocker(http://www.computeronlinetips.com/Free-Dump/AppLockerV1102.zip) link. Download it and run the easy setup.
After installation, double click on AppLocker icon on your desktop to start the Application Locker software. Now this application will display the list of computer software programs like Microsoft Word, Excel, Internet Explorer and many others.
Here click on any application checkbox and then click on Save button to block any software. For example, if you want to block Internet Explorer then select the checkbox of internet explorer and now after saving the change click on Internet Explorer to start it
Now here you can add other application other than the default lock application list, you can lock other programs by clicking the “Configure” button to open the configuration window. Type the caption you want displayed on the ‘Lock application list’. Then, type the programs executable file name and click the ‘Add’ button to add new applications.

Disable the right click functionality on the desktop
Today tip is very useful particularly for home users who want to protect their system default settings against unwanted changes that other users can make. For example changes in system desktop appearance, themes, and screen saver as well as other display settings. Using registry editor, you can disable the right click functionality on desktop to access the "Display Properties" dialog box and this will also prevent users to access windows explorer.
Follow the given steps to disable the right click functionality on desktop:

To use this feature, you will need to be logged into your computer with administrative rights.
Click Start button and type regedit in Run option then press Enter for next
Here locate the location to:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

Here in right side panel, right click to create a new DWORD value with the name NoViewContextMenu (it is case sensitive), then assign number 1 in value data box.

Now close the registry editor and restart your computer after any changes to go into effect.
But next time, if you want to enable right click functionality on desktop then simply change the value of data box or delete the NoViewContextMenu DWORD item.

Turn Off the Dr. Watson Debugger
Dr. Watson is a program error debugger that detects and diagnoses program errors in Windows and creates log files that contain the diagnostic data.

To turn off the Dr Watson debugger, apply the following Windows registry change:

Always be sure to backup your registry before making any changes !

To edit the registry go to Start, then Run and type in regedit and click Ok. To backup your registry go to File then Export and choose a location and name for your registry backup.

Hive: HKEY_LOCAL_MACHINE
Key: SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug
Name: Auto
Type: REG_DWORD
Use a Value of 0 to disable
Use a Value of 1 to enable

To re-enable Dr Watson, you can also type drwtsn -i from a command prompt

Helpful DOS Commands

Sometimes when troubleshooting your computer you will need to use command line based utilities to find information or run programs that you can’t do within Windows. In this section we will go over some of the more helpful DOS based commands that you can use to solve your computer problems.

To get to a command prompt go to Start, Run and type cmd (command for Windows 98) and click Ok.

Some of these commands use switches which are different options that will make the command do different things. Switches are usually used by typing a / and then the switch after the command. For example: Command /switch. You can also type Command /? for help on that particular command such as the available switches and how to use them.

* Chkdsk - Creates and displays a status report for a hard drive based on the file system and also lists and corrects errors on the disk.

/f : Fixes errors on the disk.
/r : Locates bad sectors and recovers readable information.

* Copy - Copies one or more files from one location to another
* Del - Deletes specified files.

/p : Prompts you for confirmation before deleting the specified file.

*
Dir - Displays a list of a directory's files and subdirectories.

/p : Displays one screen of the listing at a time.

*
Exit – Exits the command prompt utility.
*
Gpupdate - Refreshes local and Active Directory-based Group Policy settings, including security settings.
*
Hostname - Displays the host name portion of the full computer name of the computer.
*
Ipconfig - Displays all current TCP/IP network configuration values and refreshes Dynamic Host Configuration Protocol (DHCP) and Domain Name System (DNS) settings.

/all : Displays the full TCP/IP configuration for all adapters.
/renew : Renews DHCP configuration for all adapters.
/release : Sends a DHCPRELEASE message to the DHCP server to release the current DHCP configuration and discard the IP address configuration.

* Mkdir - Creates a directory or subdirectory.
* Mmc - Opens Microsoft Management Console (MMC).
* Move - Moves one or more files from one directory to the specified directory.
* Nbtstat - Displays NetBIOS over TCP/IP (NetBT) protocol statistics, NetBIOS name tables for both the local computer and remote computers, and the NetBIOS name cache.

-A IPAddress : Displays the NetBIOS name table of a remote computer, specified by the IP address.
-n : Displays the NetBIOS name table of the local computer.
-RR : Releases and then refreshes NetBIOS names for the local computer that is registered with WINS servers.

* Netstat - Displays active TCP connections.
* Ping - Verifies IP-level connectivity to another TCP/IP computer by sending Internet Control Message Protocol (ICMP) Echo Request messages.
* Print - Sends a text file to a printer.
* Rename - Changes the name of a file or a set of files.
* Shutdown - Allows you to shut down or restart a local or remote computer. Used without parameters, shutdown will logoff the current user.

-l : Logs off the current user.
-s : Shuts down the local computer.
-r : Reboots after shutdown.
-a : Aborts shutdown.
-f : Forces running applications to close.
-m [\\ComputerName] : Specifies the computer that you want to shut down.
-t xx : Sets the timer for system shutdown in xx seconds. The default is 20 seconds.

*
Sfc - Scans and verifies the versions of all protected system files after you restart your computer.

/scannow : Scans all protected system files immediately.
/scanonce : Scans all protected system files once.
/scanboot : Scans all protected system files every time the computer is restarted.
/revert : Returns the scan to its default operation.

*
Time - Displays or sets the system time.
*
Ver - Displays the Windows XP version number.
*
Xcopy - Copies files and directories, including subdirectories.