Is your FTM login going to the same account that this existing tree is in as the owner?
Your use of "mb" I hope is incorrect, as Windows 7 will not run on a machine with 16Mb of ram. It needs at least 1 GB of RAM. I think you also mean that you have 2 500GB drives for data storage.
I have read where the SSD drive are fast, but they are not large enough to hold ALL of the Operating System, so the over all performance is much slower.
Sounds like you did NOT do a sync, but uploaded a NEW Ancestry Member Tree.