The first time you go debugging classic ASP scripts on IIS7 you'll just get errors that say "An error occurred on the server when processing the URL.
Please contact the system administrator".
To see the real error, go to MMC and load the IIS Manager snap-in and go to your website. Double click on "ASP" in the Features View tab, drill down
into Debugging Properties and change "Send Errors To Browser" to true.
This will display the exact error message. Furthermore to resolve this :
1. navigate to c:\windows\serviceprofiles\networkservice\appdata\local\temp
2.. Right click on the folder, select Properties.
3.. Click the tab labelled Security.
4.. Click the Edit button then the Add button.
5.. Type the name IUSR. Click OK.
6.. It will be listed in the list of user names - select it
7.. In the box below showing "Permissions for IUSR", make sure the "Full
control" box is ticked.
8.. Click OK. Click Ok
