I tried to install WebSite X5, but it would crash before the program's installation began. I found the problem to be a missing Msvbvm50.dll file.
If you have run into this problem, do the following:
1. Download the file from the following URL: http://www.dll-files.com/dllindex/pop.php?msvbvm50
2. Unzip the downloaded file and place the DLL in your Windows\System32 directory.
3. Install WebSite X5.
Just as a side note: I used pookmail.com as my disposable email service, since the registration process requires an email address.
Enjoy.