How to restore default settings for Internet explorer for Windos Vista Home?

Unfortunately I made some changes to the properties of Router as I am using Wireless internet.....like DNS server or TCP/IP...i don't know what I did . Sometimes inter net works but most of the time message came ...can not open the page....please tell me what to do?
How to restore default settings for Internet explorer for Windos Vista Home?
have you tried system restore?

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