new forum setup issue?

With Windows 2008 R2 there are a couple of things that could cause this.

1. Permissions issue. Have a look at the application pool for the website that you are installing the forum on and set read,write, and modify permissions on the forums 'database' folder for the user or user group that the app pool is running under.

2. Edit using the Advanced Setting option the settings of the app pool that the forums website is running under and set the following:-

General -> Enable 32-Bit Applications - True
Process Model -> Maximum Worker Process - 1
Rapid Fail Protection -> Enabled - False

With the permissions you need to have a look at the application pool that the forum is running under and see what user account it is running under. Once you know this you can go to the forums 'database' folder and give that user account read, write and modify permissions on the folder.

If you can not find the user account then what you can do is grant read, write, and modify permissions to EVERYBODY on the database folder. WARNING: This is a dangerous permission to set as it gives everyone permissions to read, write, and modify this folder, so as soon as the setup has complete remove the EVERYBODY permission from the folder immediately!