How to delete the "Windows" folder from external disk?

[vitoco]

I took the 500GB disk from my dead notebook and decided to keep old data within it as an external storage in a USB case.

The drive was bootable as Win7 pro x64, but now I want to remove all system folders from it, keeping all backups and private data untouched, but I need special rights for most of the folders/files inside Windows folder: it requests for TrustedInstaller privileges.

I'm using a Win7 enterprise 32bit, logged in as a AD domain user that is also on local Administrators group. I tried taking ownership, but it failed.

How can I remove those unused system folders?

Thank you in advance.

 

[Kaktussoft]

Reboot into "recovery environment" and enter "command prompt".
find the right driveletter:
DIR C:\
DIR D:\
etc

RMDIR /S X:\Windows
replace X with right driveletter