Lenovo ThinkServer RS110 - Manual (Page 17)

The uninstall command for EasyUpdate is:
MsiExec.exe /X{743FC604-48CF-4CF8-B99F-9C3F283442FD} /qn
The uninstall command for Update Retriever is:
MsiExec.exe /X{F25C538D-3F57-4AF4-80DD-B1DD1558F038} /qn
Chapter 2. Installation 11