Why isn't it acceptable? Many people do it. I have had my computer for five
years and installed hundreds of distributions on it in that time and I still
have the same Windows XP on it that came with the computer. I don't ever
user Windows, but it has never suffered due to Linux's presence. It is the
same as it was the last time I used it. I boot into it every six months or
so and stay long enough to remember why I don't use Windows.

If you want to run Windows and Linux programmes at the same time WUBI does
not help. You need a VM to do that.