For your computer, I'm not sure what the issue could be since it sounds like you are following the correct procedure (what type of motherboard is it -- Nforce ??) Nforce 2 caused problems for some people, but I don't recall the computer automatically rebooting. Is this the first version of Neo Power Kit you are installing, or are you upgrading from a previous version that worked before?
For your notebook, a lot of people have that problem. The usb ports on the notebook aren't strong enough, so you generally need to buy a separate usb hub with an external power supply (don't know if that would fix your first problem, though)
BruceG