Dell System Detect will not install on Dell 8500

I cannot get my Dell 8500 to install the Dell System Detect so that I can find out what the problem is with my computer.  I get an error message: 

See the setup log file located at 'C:\Users\Patricia\AppData\Local\Temp\VSDECDB.tmp\install.log' for more information..  What should I do?

Thanks.