Since there is no information about the software in terms of manuals or troubleshooting, the only thing I can recommend is reinstallation of the software. If you have Windows Vista or above, use Run as Administrator to start the program.
Alternatively, send an email to the developer using the following contact form: http://www.guiaerp.com/contact-us.php
Explain the problem with the software and he should give any indication. You might have to send some crash logs to properly diagnose the error you encountered.
