Where on my computer do i enter my the internet info my isp gave me

Hello, I have a Dell inspiron laptop. A few wks ago while on the internet, i get a notification saying "something" needs to make changes to the configuration, do i want to proceed. I say no. Suddenly I no longer have internet or wireless access (wireless is enabled and started in services). So I did a restore to an earlier known good date and still no access. took laptop to the public library where wifi is open to the public, got about 3-4 bars, but couldn't access IE. Any suggestions? Thank you.
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More about where computer enter internet info gave
  1. go to your url bar and type in 192.168.2.1 and press enter. you should have access to your router settings.
  2. possibly could be 192.168.1.1 with Linksys
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