[ubuntu] I have a vista/ubuntu dual boot setup- I want to upgrade vista will the affect ....

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http://ubuntuforums.org – I have a Vista/Ubuntu dual boot set up (with Grub to manage it). I am about to upgrade from vista home basic 32 bit to windows 7 ultimate. Before I do though- I want to make sure that this will not mess with my boot loader. I remember that when I was setting up my PC- I had to specifically install windows first and then ubuntu because the windows boot loader does not play very nicely with other operating systems. I just wanted to know if anybody here has experience with this and how would I go about doing this without messing up my boot up settings. (Hardware)