How to Create and delete User Account Via Dos Prompt ?

to add a user:

net user <username> <password> /add

to remove

net user <username> <password> /remove

Examples: net user yashraj raj143 /add
                  net user yashraj raj143 /remove

If you done correctly you got following message.

The command completed successfully. 

Try typing net help... or net help user. The former gives descriptions about each of the commands that can be used with net and the latter gives a description of the command net user.

Delete the Recycle Bin icon from the desktop

To delete the Recycle Bin icon from the Windows desktop follow these steps:
1. Open Registry Editor.
2. In Registry Editor, navigate to the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace
3. Find the following key:
{645FF040-5081-101B-9F08-00AA002F954E}
Delete the above key.

Note: As always, before making changes to your registry you should always make sure you have a valid backup. In cases where you're supposed to delete or modify keys or values from the registry it is possible to first export that key or value(s) to a .REG file before performing the changes.

4. Close Registry Editor.
There is no need to reboot. Just wait a few seconds and see how the icon disappears from the desktop.
5. In order to restore the Recycle Bin icon to the desktop just re-create the missing key (or import it back to the registry in case you've exported it earlier).
In Registry Editor, navigate to the following registry key:
KEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace
Create the following key:
{645FF040-5081-101B-9F08-00AA002F954E}

(just copy/paste, including the brackets).

APPLIES TO:
* Microsoft Windows XP Home Edition
* Microsoft Windows XP Professional
* Microsoft Windows 2003