Cache-Control, internal server error

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Hey there, I have C5 running smoothly on my localserver (IIS, FastCGI and MySQL), my Host has the same set-up, however when installing C5 on my host servers (PHP on IIS, FastCGI and a MySQL database) I get the following error
nternal Server Error Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma: no-cache Content-Type: text/html Expires: Thu, 19 Nov 1981 08:52:00 GMT Server: Microsoft-IIS/7.0 X-Powered-By: PHP/5.2.10 Set-Cookie: CONCRETE5=qlg65272664k1j4b7f2i5fb0f2; path=/ X-Powered-By: ASP.NET Date: Sat, 24 Apr 2010 22:52:10 GMT Connection: close Content-Length: 691
Concrete CMS
Unable to connect to database.
A database error occurred while processing this request.


Any ideas?

I get as far as entering my server and mysql-db details on the C5 startup screen, then get to 'index.php/-/configuration' which is blank, throwing up the error above. It's very confuzzling, as the site.php is a blank file, tried rejigging my localserver site.php to suit my host-server but no avail, keeps throwing this error :( , at wits end, would appreciate any help!

Kind Regards,

Joe

JoeGlasgow