but having just posted in another forum thread about problems disabling Windows Synchronisation in an XP system I learned a few things. That other discussion is here;
And have a look at my post at the end.
Your problem just made me wonder. You are using Windows 7 on your two systems so I looked up Win 7's synchronisation options and found this;
It is Windows own, and although the link is about Windows Vista, Win 7 also has this feature.
Another link if you want to read it is http://blogs.technet.com/b/netro/archive/2010/04/09/how-the-synchronization-in-windows-7-offline-files-works.aspx
Does any of that help?