i have changed internet security settings from unsecured to
secured reset wireless router now reading limited or no connectivey
properties read lost ip address
As you give so little information it's difficult to comment. However you have probably set the WEP or WPA key wrong. That is to say you have entered it wrong on the PC - different to the one that you set in the router. If you can't sort it out on the PC you'll need to connect to the router via an Ethernet cable to reset the wireless parameters again.
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Try fixfault.com to fix notebooks/laptop pcs.