Object reference not set...

So I am new to this. I usually just fix computers and not mess with this kind of stuff. So if I don't act like I know what is going on, that is because I don't. So here it goes. We have SBS 2003. Someone loaded front page extensions which hosed up our companyweb, anyhoo I removed the front page extensions on companyweb (which somehow our default web page was point to also) and installed Share point. So far so easy no problems. I got the share point working, Exchange Web was working, web page working. We also have a piece of software called Bill Quick which has a web interface for just entering time. That no longer worked. It has a Virtual directory that has to be created in the default web page. I could not see the page, so I did some research on the error and found that Share point changes security settings. I changed them back to full in the web.config file and now I get the log in page (default.aspx) I put in the user and password and get a

Object reference not set to an instance of an object.
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.NullReferenceException: Object reference not set to an instance of an object.

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:


[NullReferenceException: Object reference not set to an instance of an object.]
Webi2005TE.wbFrmMain.Page_Load(Object sender, EventArgs e) +427
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750




--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:1.1.4322.2032; ASP.NET Version:1.1.4322.2032

Any ideas would be most helpful.

Thanks
Aaron