In order to use the "LGRx package" I've been told in a previous question that I've made, that I should have an up-to-date TeX distribution.
So, I wonder what is this and how can I install it to my PC? Note that my OS is the windows 7.
As of today, MikTeX version 2.9 is the latest stable distribution, so you should be fine for now.
However, for future refence (and based on Torbjorn), you should check:
Also, I recommend you give a little read to this question, since you are also trying to use a package: