problem on Web service release!

Question

my web service in VS2005 is ok in debug version, but when it is released,  the web popped up with wrong message  which said "could not open the web".

1. In my codes, I use the absolute path such as "C:\\Inetpub\\wwwroot\\ServiceTest\\11.bmp";

2. the dll  called in the webservice is put in the path "C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\ " and " C:\Program Files\Microsoft Visual Studio 8\Common7\IDE\"

It's my first web service and so far I could not find the cause,

would you help me, please?