Absolutely the same problem. VMtools service unexpectly stop, VBR 6.1 service unexpectly stop, maybe_some_other service unexpectly stop, after applying the last Windows Updates. Other services is not VMware problems, but it can help to understand what happend. For now i have to stop other servers updating (i am glad that affect just for first testing servers group).
Mostly intresting it is i don't see any error in the logs that can indicate the problem. Just stopping services.
I forget to say that i reinstall services (tools&VBR) and uninstall last updates but crashing is keep on. I turned on vmtools debugging on one of VM but have no dumps (crush dumps folder was empty). For now I try to debug other machines and waiting.
update: service on 3 of 5 machines stopped. No crash dumps, no messages in Windows event logs, nothing at all. VBR stopped also. I have no ideas. Left arming with a tambourine and call spirits =\