http://www.windowsreference.com/security/reset-the-entire-registry-permissions-to-defaults/

I had some problems with my registery permissions a while ago, I couldn’t delete any thing any more, so I was looking for something that could reset my registery permissions to defaults. Here is the solution that worked for me

If you want to reset the entire registry permissions to defaults follow these steps

Note:- Before Doing any changes to registry plesae take a backup and start your changes

First you need to download SubInACL from here

SubInACL is a command-line tool that enables administrators to obtain security information about files, registry keys, and services, and transfer this information from user to user, from local or global group to group, and from domain to domain.

Create a file with the name reset.cmd under C:\Program Files\Windows Resource Kits\Tools folder

Now you need to Edit the reset.cmd file and add the following lines

subinacl /subkeyreg HKEY_LOCAL_MACHINE /grant=administrators=f
subinacl /subkeyreg HKEY_CURRENT_USER /grant=administrators=f
subinacl /subkeyreg HKEY_CLASSES_ROOT /grant=administrators=f
subinacl /subdirectories %SystemDrive% /grant=administrators=f

subinacl /subkeyreg HKEY_LOCAL_MACHINE /grant=system=f
subinacl /subkeyreg HKEY_CURRENT_USER /grant=system=f
subinacl /subkeyreg HKEY_CLASSES_ROOT /grant=system=f
subinacl /subdirectories %SystemDrive% /grant=system=f

Save and exit your file

Now you need to open command prompt run the following command

cdcd “C:\Program Files\Windows Resource Kits\Tools”

after this press enter and enter the following command

reset.cmd

after entering this please press enter

fter a few minutes by processing subinacl, the permission will be reset