First you have to make sure you should have working internet connection. Error 815 mostly related to ISP side so suggest you to contact ISP first.
You can also try below steps if ISP says everything is fine.
If the connection can be established by using other device/system, please create a new administrator account on the Windows Vista machine to troubleshoot the issue:
1.Click Start > type user account and click the User Accounts control panel.
2.In the User Account control panel, click Manager another account.
3.Click Create a new account, type an account name > select Administrator and then click Create Account.
4.Logoff and logon with the new account and try to establish the connection to check if the issue persists.
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