Windows7 repair Install and bootloader

I cuurently have EasyBCD installed.
I have Windows7 installed on one hard drive and WinXP on another (WinXP was installed first).

I am having some Win7 USB driver issues that can only be solved by a Repair Install. (I have tried all other options).

My loader files are on the WinXP disk. I know this because when I boot to either disk from the BIOS boot screen I get the EasyBCD boot menu. I also get the EastBCD Boot Menu if I boot normally.

My question is this...if I do a Win7 Repair Install will it alter this.

My fear is that after I do the Repair Install, I will not be able to get to my WinXP, which is my Main System. My Win7 is currently only for gaming.

Thanks

Doug