Loss of Internet after McAfee internet security upgrade - please help

Hello, I am a first-timer here wanting some advice as I am feeling quite stuck. I have a Dell Inspiron laptop running on Microsoft XP version 2002, Service Pack 1, I was recently prompted to update my McAfee Internet Security and ever since I did this I have been unable to access the internet or open my iTunes. Whenever I start up my computer I get the error message wcescomm.exe unable to locate component. The application failed to start because SPORDER.dll was not found. Re-installing the application may fix this problem. What do I need to do to get rid of this message and get my internet back? Will it help if I go into the control panel and remove the McAfee stuff? I only have an older version on CD and am worried about uninstalling as I won't be able to download again without an internet connection. Please advice. I am quite computer literate but when things get too technical I get confused. Any help will be greatly appreciated.