Cannot connect to internet but was working other day

Ok I have a wireless WRTG5 (or whatever) version 5.0
I have Verizon DSL and the wireless network consists of a laptop and Xbox and the main PC, which im on now. Last night, I guess we lost power for a split second cause the battery thing started beeping. My dad pushed the button, as you're supposed to do, to shut the PC off and then turned it on again.
When it was all done, nobody touched anything, but the wireless isn't connecting the net connection. We've had it working for about a month, maybe a bit more. I can connect, obviously, directly via the modem.
When I try to do wireless, the adapter connects to the router but then it says "You are connected to the access point, but the Internet cannot be found." Again, nobody touched ANYTHING outside of the button thing on the PC, which has been done before and hasn't affected the wireless. I tried resetting it, unplugging, and even repairing. Didn't work.
Any help would be appreciated, and this is my first post and I DID Look through the other threads, but decided I needed some specific help. I'm not ultra geeky when it comes to PC terms, so try to make the replies easy for someone like me to understand.
Thanks in advance.

Sorry, it's my Desktop PC that the Router and Modem are connected with.
I went into the thing with my IP addy into internet explorer. I couldn't find where to change the IP and all the stuff with the IP seemed normal. None of them had the one that the router said it was operating on.
If I create a NEW umm channel, or whatever, will I have to redo the Laptop and my Xbox config wirelessly? I should note I had a friend install all of this router/wireless stuff for me, since I am nto good with this kind of thing. So, I'm not completely up on how to do all this stuff. I was gonna ask if he could do something but I haven't got the chance to talk to him, so I came to you guys.
That's where the situation stands right now. I just wanna make sure I'm not setting myself up for hours of work. I'm sure it's easy, since he didn't take too long setting it up. But I don't like messing with things that might screw up my system/modem etc beyond what it is already.

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Message was edited by: SRV007

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Sorry, it's my Desktop PC that the Router and Modem are connected with.
I went into the thing with my IP addy into internet explorer. I couldn't find where to change the IP and all the stuff with the IP seemed normal. None of them had the one that the router said it was operating on.
If I create a NEW umm channel, or whatever, will I have to redo the Laptop and my Xbox config wirelessly? I should note I had a friend install all of this router/wireless stuff for me, since I am nto good with this kind of thing. So, I'm not completely up on how to do all this stuff. I was gonna ask if he could do something but I haven't got the chance to talk to him, so I came to you guys.
That's where the situation stands right now. I just wanna make sure I'm not setting myself up for hours of work. I'm sure it's easy, since he didn't take too long setting it up. But I don't like messing with things that might screw up my system/modem etc beyond what it is already.

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Cannot connect to internet but was working other day

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