The mad dash toward the "one interface to rule them all" has given us nothing but a deepening dive into a universally cumbersome user interface. While few people converse with the same tone and measure with which they write, UI designers seem oblivious to the nuances that make a platform what it is.
Will developing an OS help Gnome get a handle on this problem? Or will the OS become a distraction, like Mono appears to have been?
... most Win 7 machines have a restore partition. Simply boot into it and restore your machine to its original install state. Technically, all the bits won't be scrubbed from the drive, but unless you work at the NSA, it is unlikely anyone will recover your data.
I would suggest that, in the future, you keep your personal computing off your work machine, both for security and ethical reasons.
The configuration of the systems will be the most important factor in easing the transition. No distribution will come fully configured to meet the use cases of individual users or a task-specific group of users. I'd recommend Linux Mint KDE for the greater depth of configurability that KDE offers and the relatively finished state of configuration offered by Mint in the initial installation. Alternatively, Kubuntu will give the same basis with more of a blank slate to start. I'd suggest looking at UCK to produce a preconfigured master, specific to your situation.
I'd stress that this is an upgrade and that some adjustment will be necessary. If you buy a new car, you need to learn a new layout for the gauges and controls; improved software requires some of the same accommodations. Underline the benefits that will accrue to the users from committing to such a course.
So, you will need to 1) Configure the systems, yourself, to ease the transition, 2) Sell the benefits of the transition to get user buy-in, and 3) Educate your users to empower them with the new functionality the will enjoy.
Dynamically binding, you realize the magic. Statically binding, you see only the hierarchy.