Dual boot isn't generally recommended because Windows and Linux file systems don't mix well. Get yourself a second drive if you wan't to run them both on the same machine.
Aren't Linux NTFS drivers production quality nowadays?
And how is the second drive on the same machine helping?
If I recall correctly, it's not so much an issue of actual filesystem incompatibilities, but rather something to do with Windows not respecting the other bootloader well. Separate drives mitigate that issue.
I haven't tried dual-booting since I moved to Windows 7 (on 10 now), but I never had any issues whatsoever as long as you installed Windows first and then whatever other OS after.
Windows only clobbers the MBR during install in my experience.
You boot on one disk or the other, I think (I never did that, but a classmate did)