fix problems created by viruses

-->The command prompt has been disabled by your administrator :

FIX:

Method 1: Using the console registry tool
    *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

Method 2: Edit the registry directly

    *Open Registry Editor (Regedit.exe) and navigate to:
[HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System]
   *In the right-pane, double-click DisableCMD and set it's data to 0

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

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