Installing Zenworks 7 on OES2 SP1 and SLES 10 SP2 64bit would leave the PXE (proxydhcp) service in a broken state.
'ZENworks 7 Desktop Management on Linux Support Pack 1 Interim Release 4' fixes this.
Find more info on the TID here.
The TID also contains links to patches to resolve the issue for those running IR3.
Note the install instructions for OES: