I've done that many many times, and not only Dual, triple, etc..Up to 5 different OS including: WinXP, Win7, BT5r3, Debian, Ubuntu and LMDE in one HDD..
I do not use the term "Okkies I think it may seem the "whole world" is having issues with dual-booting with Windows 7", I don't..So I strongly belive there are few people with dual boot problems...Need to read little more about linux, partitions, Filesystems, partitioning in linux, etc..
How about delivering some info as to: kind of laptop, hardware used, HDD install? UEFI system? ...We cannot understand, or suppose or take for granted anything...Be more specific please..It will help us to know more about your problem and get a more accurate help.