During a fresh install of 4.8 I get an error at the part during the install wizard to select optional modules that can be available.  I simply select them all and click next to receive an error.  Then when trying to run the install again I get a blank page.  My timeout is set for 15min and this happens well before that.  I have Windows XP Pro, SQL Server 2005, and working in VS 2005.  In my working folder I created a folder for the new install of the dnn source which is in the website folder with the release.config changed to web.config and updated both connection strings.  I created a new database on a different server.  All permissions & communications test pass.... and so on.... but still get this error even after deleting everything and starting over again.

Server Error in '/DotNetNuke' Application.
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Request timed out.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Request timed out.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. 

Stack Trace:

[HttpException (0x80004005): Request timed out.]

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Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433