If it is a new OEM version, you should be good to go. But remember, an OEM copy is legally licenced only for the build it is originally installed on.
Yes it is a brand new copy of W7. It's one of those copies that are just 64 bit for 99 dollars retail. I always wonder though. Lets say I took a copy of Windows XP from a Dell and tried to put it on a new built, non Dell computer then used the license from that copy what would happen. Would it consider it a legitimate copy of Windows even though it's not the original OEM Dell?