Before you run build.bat you have to find the files named CSC.EXE and GACUTIL.EXE And open up build.bat in Notepad and change where it says csc /t:library etc... To C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\csc.exe /t:library and so on... The same for where it says gacutil change that to the absolute path of the GACUTIL.EXE file location.. Your location might be slightly different so if you're not sure where they are just search for the files on your comp. Then run build.bat.. If everything you did in build.bat is correct, then you should see Cassini.dll and CassiniWebServer.exe in the same directory as build.bat. After you see the CassiniWebServer.exe, double click... Then you should see a dialogbox where it asks for the "Application Directory" (your files to be served which isn't necessarily where the exe is... Just where the default.aspx and other web files you want served are located). And a "Virtual Root"(Just ignore that one and leave as-is for now). When you hit start, a link should appear on the dialog that goes "http://localhost". Click on that and it should serve up the default.aspx file in the location where you gave as the document root... E.G. ___________________________________________ Cassini Personal Web Server Application Directory : C:\Cassini\www\ Server Port :80 Virtual Root :/ ___________________________________________ That's how the server dialog box should look like before you hit start. That C:\Cassini\www\ is where I put my default.aspx file... Just change as necessary.