Erl.exe failed to start (receives 0xc0000005 exception from MSVCR100.dll module) after installing couchbase server on windows 7 64 bit

MSVCR is the Microsoft Visual C Runtime, I do believe. There had been some issues in the past that had us add an update for this to the installer. You may want to check windows update (or other Microsoft support sites) to see if there is a MSVC runtime update. Let us know if you appear to be on the latest.