Hello,
The error you received in reference to the "McScript_InUse.exe - Application Error" is because of the "Network Associates McAfee" software on your computer. To fix the error if the MAX is not working properly, you should try reinstalling the NI_DAQ driver CD again but with McAfee turned off. The other option is updating the McAfee software, which are found at http://www.networkassociates.com/us/downloads/
Also, I would recommend you to take a look at the webpage:
http://www.ni.com/support/install/default.htm, which will help you walk over the re-installation and troubleshooting process.
I hope it helps,
Rajiv