If your router is about a year or two old, its probably dead. That's about how long their lifetime is. Wifi people need to make money too you know.
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As HK says below - Need details - say...everything. What you know, what you don't know, what you've tried, and exactly what happens. Recommendation whenever a router is acting up: Unplug it. leave it off for a minute, plug it back in - now try to reconnect. Routers are small computers, and they rely on software to run. This software is often imperfect and glitches up from time to time. Reboots fix 90% of wireless problems.
Can we have a few more details, please? Like what kind of computer you are trying to connect, was it working before, if yes, when, what changes have you made since then, etc, etc.