When you attempt to run CMD.exe or a batch file, you may receive the message “The command prompt has been disabled by your administrator“. This is caused by restrictions placed in Registry. DisableCMD value is set to 1 or via Group Policy. To enable Task Manager, try any of these methods:

Method 1: Using the console registry tool

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Click Start, Run and type this command exactly as given below: (better - Copy and paste)

REG add HKCU\Software\Policies\Microsoft\Windows\System /v DisableCMD /t REG_DWORD /d 0 /f

Open Registry Editor (Regedit.exe) and navigate to:

[HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System]

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In the right-pane, double-click DisableCMD and set it’s data to 0

Method 3: Using Group Policy Editor in Windows XP Professional.

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Click Start, Run, type gpedit.msc and click OK.
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Navigate to User Configuration \ Administrative Templates \ System
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Double-click the Prevent access to the command prompt