Apparently the Windows Insider programme will continue even after July 29.
This means that if you have a PC around without Windows 7 or 8, you can still avail yourself of a free copy of Windows 10 Windows 10 preview builds via the insider programme, which will probably run better than Vista and is certainly safer than XP.
Join the Insider programme, download and install build 10130 on your old PC and enjoy Windows 10 Windows 10 preview builds via the insider programmee for free.
I wonder if this is a good opportunity for Mac users to grab a copy of Windows for VM use.
Mod 23/6: It has been clarified that those without Windows 7 or 8 must remain on the Windows 10 insider program and continue to receive preview builds of Windows 10. Leaving the program will cause Windows to revert to your previously installed version on your machine. See comments for more information. Title & details updated.
The USB-3.0 drivers should have come with the Mainboard, and if you no longer have that stuff, look up your Mainboard online and check out it's specs. USB-3 ports and cables are generally colour coded blue, so the cable is normally blue and the port connection should have a blue tongue on the inside.
Also note that USB ports are both backwards & forwards compatible so "USB-3 compatible" is not the same as a "USB-3 port".
As an example; I'm always moving so I carry a Samsung 840pro 512GB SSD (bought a few years) with PortableApps so I can access Thunderbird, Firefox, Open Office documents, etc. where ever I am. The little Silverstone enclosure it's in is USB-3 and works fine on any computer port from USB-1 to USB-3.1