I Created a DSN for my ASP application, when I run it, I got the error:
Error Type:
Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
[Microsoft][ODBC Driver Manager] Data source name not found and no default 
driver specified

the weird thing is any DSN I created before 2 months ago are working, any 
DSN I created newly are not working, To run the asp application, I use the 
DSN I created long time ago, just replace the old database with the one I 
want to use, It works just fine.
I don't know what happened. I tried to reinstall the MDAC 2.6, and later I 
install the MDAC 2.7, it still doesn't work. and I open the registry to 
see if there any differnce BTW the old DSN and the new DSN, the values are 
the same. and any old DSN created, when I check the configuration, once I 
click OK button, than it doesn't work any more. So I am really confused, 
did I  miss something?

Any ideas are welcome. 

Thanks you very much.