As much as I love it, it may occasionally be necessary to remove the System Center Configuration Manager client. I recently had a customer who could not get a machine to upgrade from 2007 to 2012 and after attempting many things we did a manual clean down of the client then the 2012 client installed just fine. If you need to remove the client you can do so fairly easily by running ccmsetup.exe /uninstall. Ccmsetup should exist on all clients, usually under the windows folder. In the event that the command line doesn’t work here is a list of things I usually check and remove to manually clean-up all the traces of the client so I can try a fresh install.
1. SMS Agent Host Service
2. CCMSetup service (if present)
3. \windows\ccm directory
4. \windows\ccmsetup directory
5. \windows\ccmcache directory
6. \windows\smscfg.ini
7. \windows\sms*.mif (if present)
8. HKLM\software\Microsoft\ccm registry keys
9. HKLM\software\Microsoft\CCMSETUP registry keys
10. HKLM\software\Microsoft\SMS registry keys
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