Unsecured Network problem

Hello! I have WCG200 Cable Gateway modem-router and use it for about 4 years.
The problem is that unfortunately at the time of initial setup I didn’t chose an option to Password protect my network and it operates as “Unsecured Network”.
Fortunately I didn’t have any security problems with my network, but I want to protect my network against unauthorized access.
The problem is that I misplaced and somewhere lost WCG200 installation CD and now I don’t know haw to proceed with password setting? I’ve been told that it can’t be done without WCG200 setup CD.
I’ll greatly appreciate your professional assistance!
Some info regarding my network and hardware configuration: From Comcast cable => Comcast Cable Modem SBV5220 => Coaxial cable to WCG200 => Ethernet cable to Desktop computer (with Windows XP) => wireless to Laptop (with Windows Vista).
Thank you in advance for your help!

Hi.
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    Dec 23 09:42:49 MickMac kernel[0]: ASP_TCP CancelOneRequest: cancelling slot 12 error 35 reqID 3205 flags 0x19 afpCmd 34 so 0x8051b28"
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    Dec 23 09:45:49: --- last message repeated 1 time ---
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    Dec 23 09:45:49 MickMac kernel[0]: ore-V1/Stores/6CC2B046-5E28-4179-96B7-9DFF9F7EE431/store.db] [FSLogMsgID 1580919258] [FSLogMsgOrder Last]
    Dec 23 09:45:49 MickMac KernelEventAgent[34]: tid 00000000 found 1 filesystem(s) with problem(s)
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    Dec 23 09:45:49 MickMac kernel[0]:
    Dec 23 09:45:49: --- last message repeated 1 time ---
    Dec 23 09:45:49 MickMac kernel[0]: disk1s2: 0x14 (UNDEFINED).
    Dec 23 09:45:49 MickMac kernel[0]:
    Dec 23 09:45:49: --- last message repeated 1 time ---
    Dec 23 09:45:49 MickMac kernel[0]: disk1s2: 0x14 (UNDEFINED).
    Dec 23 09:45:49 MickMac kernel[0]:
    Dec 23 09:45:49: --- last message repeated 1 time ---
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