So what other software is there to run on PC and will it run office?
Well, you could run various versions of Linux and then there are several open Office varieties that will load and save MS Office files. I am not certain how Wine (a limited Linux single app emulation of Windows) will do with running the latest version of MS Office but it's worth a try.
The real problem is all the specialty vertical solution software out there that will only work on Windows. It is highly unlikely to work on Linux even under Wine. There you'd have to use something Apple's OS X on a Mac running a virtual machine running a single instance of Windows just to run the vertical solution software ONLY in a sandbox, not allowed to connect to the Internet, leaving all else on the Mac side. You could try building a Hackintosh on your PC hardware, but only certain configurations of PCs are capable of being converted to Hackintoshes.