Problem running Draftsight on Vista

I have just installed Draftsight on my hp550 laptop which is Vista OS. There were no problems with the installation. However, when I try to run the software, I get the message "C:\\window\\system32\\winrnr.dll is either not designed to run on windows or it contains an error. Try installing the program again using the orginal installation media or contact your system administrator or softeare vendor for support"

This message comes back imeadiately, when closed, and for many times. Eventually, if I persist in closing the error message, Draftsight does open, but after about 1minute, it suddenly crashes! The task bar displays a message "Diplay driver has stopped responding and has been recovered"

Can anybody advise me on getting over this problem?

Thanks in advance

John