Possibly, but I'd expect it to time out or something and then return control to the installer.
Terminating the process should work too... weird.
Well, tried again, same story, but this time i choosed another approach. Installation starts, AskInstallChecker-1.4.0.0.exe shows up in temp folder and BANG! installation halts. Killing the Setupimgburn process works fine, but killing the AskInstallChecker-1.4.0.0.exe process is not possible at all. Trying to start the installation again just produces error message about not being able to write to AskInstallChecker-1.4.0.0.exe. But now i pressed the "Abort" button instead of "Retry" or "Ignore" and installation went thru without problem. AskInstallChecker-1.4.0.0.exe process still impossible to kill though, computer needs to be rebooted to stop it.
Conclusion: Nothing wrong with Imgburn, something very wrong with Ask Toolbar installer (AskInstallChecker-1.4.0.0.exe)