I've been looking into it more and if possible, It would be cheaper to get the e6600 and a nice gpu rather than building a new system. So, my new question is will the e6600 work with the 0k068d LGA775 motherboard?

ok from what ive read you are not getting all the info ok you REALLY need new ram atleast 8gigs DDR3 for any cod games in general it sounds like your system is very old and i would recommend re considering ''upgrading'' and really think about rebuilding your system also you REALLY REALLY REALLY need to learn more about computers its easy but not if you dont know anything at all about them do some research on fourms and not just ''is this compatible with this''also that cpu is VERRRYYYYY WEAK dont even think about getting it