When I Open m Web sometimes it Takes "SHAREPOINT\system" Account insted of My Own Account.. Can anyone help me why it is doing like that?
Probably one day we you enter the credentials you check the box to memorize it. To change this, on your computer go in Control Panel > User Accounts > Manage Windows Credentials. Then in the list look up for your server and the credentials that are set and delete them.
On the next prompt to SharePoint website you should be able to specify your own credentials and memorize them.