I don't own any Razer products, but tried their Surround software recently since they were offering it free. It installed and ran fine first time along with the Synapse GUI it works inside of. I uninstalled it to see if it was causing an audio problem I was having, which I found it wasn't, but it didn't wan't to reinstall properly. Basically Synapse would install but not the Surround codec. I Googled and found many others to be having this or similar problems.
I chatted back and forth with Razer's support staff via email several times, and finally after having to repeat myself numerous times and having been handed from one person to the next, to the next, I finally got it working again. The solution ended up being a combination of thoroughly removing bits left over in the registry, rebooting after reinstall, then changing my login. I saw the Razer Surround codec showing up in msinfo32, but I couldn't get the GUI to respond until I changed my login.
I know Razer are trying to do some good stuff for gaming, but my GOD it seems they are offering so many products now they can't keep track of quality control anymore, and quite frankly their customer service kinda sucks too. Their phone support seems to be farmed out to some cheap call center in India, so don't even try bothering with phone help. This change login thing makes me skeptical whether Surround being free to use is only intended as a one time thing as a hook to get people to buy their hardware.