jesa k bhaiyo is se pehle wali thread me mein ne apko task manager enable krne k methods btaey they. is post me mein apko REGEDIT enable krne k methods btaoon ga. Regedit b kai reasons ki wajh se disabled ho jata hy.
bus me apko us k solutions bta deta hoon.

Method 1: Using the REG.EXE console tool
1. Click Start, Run and type this command: You can copy n paste it.

REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Pol icies\System /v DisableRegistryTools /t REG_DWORD /d 0 /f
You should be able to launch Tweak UI, as well as the Registry Editor.

Method 2: Using the Group Policy Editor (Windows XP Professional only)
Click Start, Run and type gpedit.msc and press ENTER
Go to the following location:
User Configuration | Administrative Templates | System

Double-click Disable registry editing tools and set it to Not Configured
Exit the Group Policy Editor


Note: If the setting already reads Not Configured, set it to Enabled, and click Apply. Then revert it back to Not Configured. This ensures that the DisableRegistryTools registry value is removed successfully