“Computer Management” MMC needs repair.

Hello gentlemen, I’m a newbee here.
So, I gave a question and need some help if You please…

I’m running WinXP/SP2. When I tried to install O&O Defrag it worked fine. I decided not to buy and uninstalled it.
What I found later, that my main MMC snap-in “Computer Management” lost all the items under the “Storage” folder.
No more “Removable Storage”, “Disk Defragmenter” and “Disk Management”.

I have a full system backup but it a little too outdated. And reformatting and reinstalling XP is out of question completly.

Could You recommned me any tool (free or not) to edit the MMC snap-ins? Or any other method to repair?

Yours…