Wifi is connected but won't work

I have an iphone 4. I recently got internet back up at my home using an older wireless router. At first my wifi worked, but then we tried to hook up a older imac osx computer to the same router. After this my wifi just stopped working. I've disconnected my cable modem and also the wireless router, and reset my network settings on my iphone. It still does not work. I know there is a problem if my ip address on my iphone starts with 169 BUT, my ip address nor the subnet mask, router or DNS shows information to know if i have this problem.
Overall, my iphone picks up the wireless, has a check next to the network, but the wifi signal on my homescreen doesn't display even though i have the check. It just still has the "E"
please help!

I was trying to update the firmware, but when i tried to download it from the linksys website it downloads but my computer doesn't recognize what to open the file up with. Does it matter if i'm trying to update the firmware if i'm not using the original computer that i've first hooked the router up to?

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              Exit:[SQL_SUCCESS]
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    [ODBC][27847][SQLAllocHandle.c][346]
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                   Handle Type = 2
                   Input Handle = 0x507700
    [ODBC][27847][SQLAllocHandle.c][464]
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                   Connection = 0x507ce0
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                   Authentication = [bar][length = 3 (SQL_NTS)]
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                   Handle Type = 3
                   Input Handle = 0x507ce0
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                   Connection = 0x507ce0
                   SQLState = 0x7fffffffd750
                   Native = 0x7fffffffd748
                   Message Text = 0x7fffffffd760
                   Buffer Length = 500
                   Text Len Ptr = 0x7fffffffd74e
    [ODBC][27847][SQLError.c][461]
              Exit:[SQL_SUCCESS]
                   SQLState = IM003
                   Native = 0x7fffffffd748 -> 0
                   Message Text = [[unixODBC][Driver Manager]Specified driver could not be loaded]
    [ODBC][27847][SQLError.c][424]
              Entry:
                   Connection = 0x507ce0
                   SQLState = 0x7fffffffd750
                   Native = 0x7fffffffd748
                   Message Text = 0x7fffffffd760
                   Buffer Length = 500
                   Text Len Ptr = 0x7fffffffd74e
    [ODBC][27847][SQLError.c][461]
              Exit:[SQL_NO_DATA]
    [ODBC][27847][SQLError.c][504]
              Entry:
                   Environment = 0x507700
                   SQLState = 0x7fffffffd750
                   Native = 0x7fffffffd748
                   Message Text = 0x7fffffffd760
                   Buffer Length = 500
                   Text Len Ptr = 0x7fffffffd74e
    [ODBC][27847][SQLError.c][541]
              Exit:[SQL_NO_DATA]
    [ODBC][27847][SQLAllocHandle.c][511]
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                   Handle Type = 3
                   Input Handle = 0x507ce0
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                   Connection = 0x507ce0
                   SQLState = 0x7fffffffd750
                   Native = 0x7fffffffd748
                   Message Text = 0x7fffffffd760
                   Buffer Length = 500
                   Text Len Ptr = 0x7fffffffd74e
    [ODBC][27847][SQLError.c][461]
              Exit:[SQL_SUCCESS]
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                   Native = 0x7fffffffd748 -> 0
                   Message Text = [[unixODBC][Driver Manager]Specified driver could not be loaded]
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              Entry:
                   Connection = 0x507ce0
                   SQLState = 0x7fffffffd750
                   Native = 0x7fffffffd748
                   Message Text = 0x7fffffffd760
                   Buffer Length = 500
                   Text Len Ptr = 0x7fffffffd74e
    [ODBC][27847][SQLError.c][461]
              Exit:[SQL_NO_DATA]
    [ODBC][27847][SQLError.c][504]
              Entry:
                   Environment = 0x507700
                   SQLState = 0x7fffffffd750
                   Native = 0x7fffffffd748
                   Message Text = 0x7fffffffd760
                   Buffer Length = 500
                   Text Len Ptr = 0x7fffffffd74e
    [ODBC][27847][SQLError.c][541]
              Exit:[SQL_NO_DATA]

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