upgrading to Mavericks from 10.6.8 with boot camp partition already for Windows 7

Hello,

I have a 2011 27" iMac/16GB ram/1TB HD on OS X 10.6.8

I did upgrade it to 10.7 but it changed too much stuff I did not like, so it was a nightmare to get back to 10.6.8

Anyway, I have a partition on there with Windows 7 Ultimate 64 bit that when I need to I boot into that partition.

I use a program called reFIT when my machine first turns on to select with one, works well as it is a EFI partition tool but no longer developed.

So regardless of the reFIT program if I upgrade to Mavericks will it screw up my Windows partition?

I have the Windows 7 disc/image so it's not a big thing but I don't want to spend days trying to make something work if it screws up what WORKS now.

You know the old saying, if it's not broke, don't fix it.......

any input would be appreciated

thanks

philmiami