None of the apps I use have compatibility issues and if you do find any (doubtful) you can run them in compatibility mode. Very certain Microsoft has tested every driver under the sun unless you're using a PC from pre 2000 you will be fine. My Realtek Audio works just fine and yes you can install to a separate partition (on the same drive) which you probably shouldn't do.
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Just do a normal upgrade and keep files and settings if you dont like it you can go back to windows 7 through windows 10 nativelyMy GPU isn't new and doesn't support DX12, I don't own an Xbox One, and no, I don't have money to get one lol. So, really, that, and I don't want to lose my installed programs or get driver incompatibilities. Does nVidia even have GTX 660 drivers for Windows 10 yet? Or Realtek for their HD Audio drivers? That's what I'm concerned about the most.
Also interesting note in the installation process here http://windows.microsoft.com/en-us/windows-10/media-creation-tool-install?ocid=ms_wol_win10
If you look at step 8, it clearly states: "On the Where do you want to install Windows? page, select the partition that you want, select the formatting option you want to perform (if needed), and then follow the instructions."
Does this mean that you can choose a different partition?
I don't want to end up regretting this.