In trying to run DHCPUtil.exe from your Windows Server 2008 x64 DHCP server with the appropriate command line parameters in order to configure DHCP for Lync Server, you may run across the following error:
The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sxstrace.exe tool for more detail.
Reviewing the app log reveals the following:
Log Name: Application
Date: 11/4/2010 2:04:30 PM
Event ID: 33
Task Category: None
Activation context generation failed for "C:\Users\administrator.UC\Desktop\DHCPUtil.exe". Dependent Assembly Microsoft.VC90.CRT,processorArchitecture="amd64",publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="9.0.30729.4148" could not be found. Please use sxstrace.exe for detailed diagnosis.
Solution: Install vcredist_x64.exe from the Lync Server media and run DHCPUtil.exe again.