Hmm, could be multiple issues but I highly doubt it's anything to do with the Core i7. I have an intel core i7 920 and it works quite nicely without any configuration. Windows 7 Home Premium x64 does all the load balancing without much effort on my part. Not to say you shouldn't stress test it to be sure, but I think it's stable enough not to be the problem.
It could be either the hard drive or the graphics card, my two possible bets. To test these you'll need to run a few tools. I see it's a Seagate HDD... just get a new hard drive right now because I've had over four of those things die within under 2 years. They won't scam me again, I'm going with WesternDigital, generally they work for much longer so as long as they arrive working (had a few DOA)... lol
That being said, run HDTune free:
http://www.hdtune.com/download.html
Check S.M.A.R.T. data readout for anything saying failure or pre-failure. Then proceed to run a quick test of the sectors, if all the blocks don't show up green you'll have some issues. Then run a benchmark and see if things get too choppy or you experience a crash. I've never had any crashes unless my HDD is going up.
Concerning GPU testing, I'm not familiar with the best tools on that. I would say try 3DMark and/or GPU-Z.
If it crashes, you know you might have some issues. And it's always best to be running the latest firmware/driver for your card. Uninstall the old driver first, before installing a new one or expect conflict. Check nvidia for the latest build, or google for optimized drivers for your card such as the Omega Driver:
http://www.omegadrivers.net/index.php?option=com_phocadownload&view=section&id=2&Itemid=55
It can be spyware or just a bunch of bloat running as Malohaut mentioned.
Run CCleaner:
http://www.filehippo.com/download_ccleaner
MBAM Free:
http://malwarebytes.org/mbam.php
Make sure your running a good and up-to-date antivirus, AVG, Anti-Vir, Avast, etc.
Firewall is preferable as well, I use Comodo. (Which makes gaming a breeze since you just enable "Game Mode" now)
Also, not sure if anyone brought this up, but if the problem occurs online it could be a jitter issue. You can get some pretty crazy lag and jitter over wifi networks which can effect game play. Try PingTest.net to annihilate that as a possibility.
Lastly, it could be a bug in the game. Make sure you patch it to the latest version (e.g. Age of Empires III goes all the way up to 1.09 from 1.0, check the companies website or google)
Hope this helps.
