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5.0 install not working

Trying to install helpspot 5.0 on windows server 2012. with sql server and IIS 8.5.
The install of all the files works, but I either get a 503 error or 500 error when going to the adminbrowser page to complete setup. I have tried
Disabling compression on the site
disabling 32 bit mode in application pool that changed the error from 503 to 500
checked all permissions for website folders gave iisuser and iusr modify permissions if they didnt have it already.
I created a php info file and placed that in the root of my folder and that file works.
not really sure where to go from here, spent way to long on this already.