I cant execute my asp.net application with IIS 5.0

Hi, please i have a problem, i can't execute my asp.net application with IIS 5.0? i have a message indicating that MYSERVER\ASPNET can't connect, and that arrive when trying connect to the database under SQL Server 2000. you have to know that my application work very well with webserver of WebMatrix. Web Matrix Project : version 0.6 .Net Framework 1.1 Thank you.

Is the server a domain controller? If so, there are no local users, so the MYSERVER\ASPNET user will not exist. If it's not a DC, have you verified that the account exisits in SQL for the ASPNET user?