You changed the security settings (WPA) on your computer or the UV RG? Both should match exactly.
You may need to try another channel, one that is being less-used in your 'hood.
http://192.168.1.254/xslt?PAGE=C_2_1
On that same page link, make sure Wi-Fi Protected Setup is DISABLED. Be sure to hit Save.
Try downloading inSSIDer and see where your neighbors are, and take a look at your signal strength.
We'll take it from there. 
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*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.