problem with running .aspx files on remote server. Urgent help needed.

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Hi
I am learning ASP.NET using C#. I am able to run .aspx files on local system, but when I load them to the server, I get the "Server Error in '/' Application" error. I have tried to configure the web.config file but has not been fruitful.
I would be thankful if the following questions were answered:
a)has the write permissions on files and folders have to do something with it?
b)what role does asp_client folder play?
c) What other configuration files are needed to run a .aspx file on a <b>remote</b> server.

PS: Its urgent...Thank you

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