Logitech makes some good 5.1 speaker set options as well and for fairly cheap, so I'd check amazon. If the software just isn't working even after reinstalling it's probably just broken or has bad compatibility with Windows 10, so there's probably nothing you can do. If you're installing it from a disk you might want to try downloading it online, it might be corrupted. But if you can't get it to work or get sound you're satisfied with from anything you currently have then I'd just go for the Sound Blaster Z, but get it directly from the Creative site (http://us.creative.com/p/sound-blaster/sound-blaster-z) because it's about $20 cheaper there than on Newegg.
Also, assuming you want to use your headphones for anything other than gaming, I'd suggest getting some new cans, gaming headsets are usually passable but generally buying some actual headphones will get you much better sound, again, just browsing on amazon for a few minutes will get you several good options for less than $150.