New Computer Infected - Fdisk or what?

Hello, I purchased a new all in one computer and somehow managed to download Dynamo Combo which is driving me crazy!!! And, I can't leave this at a customer site as a plant control computer. I could just put it back to factory specs and reload. If this is going to be rather involved, maybe I should just do that. I reviewed other threads and it looks like it would take more than a day using this method. This machine is new with just some very proprietory software on it. I would need to upload back the licenses before I perform the restore. I need to take a walk and go get some flash drives for backup purposes. Maybe someone will have responded when I get back. Here is the info you ask for on new threads.

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 8.1 Pro with Media Center, 64 bit
Processor: Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz, Intel64 Family 6 Model 60 Stepping 3
Processor Count: 8
RAM: 12205 Mb
Graphics Card: AMD Radeon HD 8690A, -2048 Mb
Hard Drives: C: Total - 943476 MB, Free - 889579 MB; D: Total - 30530 MB, Free - 30431 MB;
Motherboard: Dell Inc., 0P4T42
Antivirus: McAfee Anti-Virus and Anti-Spyware, Updated and Enabled