How to open exisiting word document from asp.net

Question

I am using VS2008 and MS office word 2007. Initially I was getting error at following code :
mw.Application wrdApp = new mw.Application();
 
To solve that problem, I used DCOMCNFG. I have added ASPNET user and I have set the identity to Lounching user. Now that problem is solved. 
 
Here is main problem, when I use the following statement, I am trying to open the document. I do not get any exception as well as there isn't anything in event log. but it doesn't open the file. It just hangs. I don't know what to do and what is worng.
 
mw.Document wrdDoc = wrdDocs.Open(ref wdFile,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing,ref oMissing);
 

Please help.
 
Thanks and Regards,
RAKESH