Hi, I am coming to the end of a SCCM 2012 R2 client deployment. I have come across 2 machines (so far)that have the SCCM 2007 (v4) client installed, and although the task is set to uninstall from the server the v5 client will not installed. iI have been using this an as template:

http://eskonr.com/2010/11/sccm-client-installation-troubleshooting-steps-check-list/

I have ran the install seperatelty from the server (boxed ticked - Uninstall existing Config Manager client) - No Install

The ccmsetup folder is created - c$\Windows\ccmsetup, but only has 3 files, no logs folder

Other machines on site has the v5 client

Checked ping from client to server and vice versa (no firewall enabled)

Boundaries/Schema/DNS - ok

Checked all local event logs.

i know you can run the local uninstall command, but as the network is vast i would like to fix to come from the server, rather than having to do this on the client.

Any tips would be great going forward.

SCCM 2012 R2 - Windows 7 Enterprise SP1

I would check that the account that is being used to push the client does in fact have administrative permissions on the computer. 

Also check the ccm.log on the server to see if it is throwing any errors on that particular workstation.

On a side note I don't think you should be set on having the fix come from the server. There will always be instances of clients that don't install correctly which can be caused by a bunch of different reasons. Not all can be fixed via the console and some will actually need to be done hands on. Even with those cases it can still typically be done remotely.