error in domain but dashboard fine

Hi ..

I tried installing wordpress for blahdiary(dot)com. It is hosted with a ASP.net arvixe a/c ..

After the installation i was taken to the dashboard which works fine but there is no activity on the website. Just the following error ..

Warning: require(./wp-blog-header.php) [function.require]: failed to open stream: No such file or directory in C:\HostingSpaces\nivin\blahdiary.com\index.php on line 17

Warning: require(./wp-blog-header.php) [function.require]: failed to open stream: No such file or directory in C:\HostingSpaces\nivin\blahdiary.com\index.php on line 17

Fatal error: require() [function.require]: Failed opening required ‘./wp-blog-header.php’ (include_path=’.;C:\php5\pear’) in C:\HostingSpaces\nivin\blahdiary.com\index.php on line 17

please help .. I do not have much knowledge about scripts but have tried renaming files, moving the files to the main directory and all .. nothing worked for me .. look forward to some assistance ..