I know this thread is old, but I ran into the same issue and I'm sure that someone else will experience the same. I almost gave my CD away. The patch is available online, no need to contact company: ftp://ftp.silverplatter.com/software/nclex/NCLEX-RN4000.exe I installed the patch, then the software (again - for the 100th time) and it finally works. However, the recommendation is to install the software first, then install patch into same folder.