Some anti-virus software may stop IRRICAD running. A known example of this is Ad-Aware Web Companion. In this case the main IRRICAD screen will load but the program will close after a few seconds. If possible add an exception into the anti-virus software for Winicad.exe. If not, uninstall Ad-Aware Web Companion.
We do notify the developers of the anti-virus software, when possible, and ask they include an exception in their next upgrade so installing a later version of the anti-virus software may overcome this issue.