Why am I getting a blue screen during windows support software installation?

After intalling windows 7 x64 (using boot camp 5.1), when I come to install windows support software to set up apple drivers for windows to run on my MacBook pro (late 2013), after installing a good number of drivers, I get suddenly a blue screen!....

What can I do, once windows is not strting up? It started well, but wth no proper drivers. Thanks.