Created On:  16 March 2011
When attempting to record a testcase on a Windows 7 system the following error may occur:

And when attempting to run an existing testcase the following error may occur:
*** Error: Unable to start open agent on local machine -- I/O error while starting  application /Agent/openAgent.exe.

These errors can be caused when user access control is enabled. SilkTest release notes state that you must have local administrator rights and UAC turned off to use SilkTest.  Turning UAC off should  stop the errors occurring.  An overview of Vista"s User Account Control (UAC) and how it affects SilkTest can be found in the following article:
Incident #2507762