Why did Mavericks disconnet my wi-fi connection?

I downloaded the free Mavericks upgrade and installed with no problem. However, for some reason my Linksys wi-fi network connection was disconnected and now I cannot reconnect unless I use the guest connection. I've tried entering the password for the main connection for my iMac but it won't go.
Any help?
Thanks.

I can establish an unsecure connection but nothing else. I tried uninstalling my Cisco Linksys router and resetting and reinstalling with the Cisco Setup Install CD, but I just keep getting a message that the router only supports certain OS and no other dialog windows. If this keeps up maybe I should just get a new wi-fi router and start from scratch? My current one is about two years old.

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    Hardware Information:
              MacBook Pro (13-inch, Mid 2009)
              MacBook Pro - model: MacBookPro5,5
              1 2.53 GHz Intel Core 2 Duo CPU: 2 cores
              4 GB RAM
    Video Information:
              NVIDIA GeForce 9400M - VRAM: 256 MB
    System Software:
              OS X 10.9.2 (13C64) - Uptime: 1 day 4:11:20
    Disk Information:
              TOSHIBA MK5065GSXF disk0 : (500.11 GB)
                        EFI (disk0s1) <not mounted>: 209.7 MB
                        Iceberg HD (disk0s2) / [Startup]: 499.25 GB (252.87 GB free)
                        Recovery HD (disk0s3) <not mounted>: 650 MB
              MATSHITADVD-R   UJ-868 
    USB Information:
              Apple Inc. Built-in iSight
              Mitsumi Electric Hub in Apple Extended USB Keyboard
                        Mitsumi Electric Apple Extended USB Keyboard
              hp psc 1310 series 
              Apple Computer, Inc. Apple Cinema Display
              Apple Internal Memory Card Reader
              Apple Inc. Apple Internal Keyboard / Trackpad
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              Apple Inc. BRCM2046 Hub
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