SPORDER.dll and network dysfunction

I am an 80 year old and not of the computer generation. I'm hoping someone here can help me, it would spare me the $150 I know my computer man will charge me.

I have a home network by linksys. Today, 1 of our 3 computers lost network access; the other 2 work fine.

The computer in question was working fine until I made 2 changes. I downloaded Mozilla Firefox & deleted McAfee Security. I did the latter from the Windows delete program menu, I did not touch anything more complicated.

Following that, my network has "limited or no connectivity" even though there is good signal strength. When I click on this notice & choose to 'Repair', it does not work, but states that the following action can not be completed: "renewing your IP address".

I looked up this address under the 'details' section & noted that it was not listed under the 'safe' section on my main computer's Zone Alarm software. I manually added it, but this did not help.

Later another notice comes up & says "SPORDER.dll" is not found. I looked for this file under Windows help & found nothing on it. On the Web I get conflicting information, some say it is a useful file while others say it is spyware.

In any event, I deleted AdAware & SpyBot to see if that would help but it did not. I tried re-installing Windows, but apparently my XP version on the computer is newer than the one I have on disk. I tried installing the ancillary files such as IE, Windows Explorer, etc, but this did not work. The message about SPORDER re-appeared, however.

I also deleted Firefox. This did not help either.

Any suggestions would be appreciated. Thank you.