I think you was misunderstood about your bro's Windows 7 why got Microsoft Office. No, Microsoft Office is not free. You can either download from the internet to install yourself or ask for tech guys to install pirate version for you. You can choose to either crack it or buy it.

Don't buy it from microsoft website or retail stores because it is priced RM1,000+. Buy the key from lelong.com.my and download the ISO from internet. There have many sellers are selling around RM100 at lelong. Go ask them how to download and install.