My windows just disappear!

[chinabestcountry]

I'm happy that i find a wonderful grub theme on github and it was really beautiful! :D But unfortunely,when i install it on my arch linux ,it works but my windows boot just disappear,but i can use my windows through the grub terminal. The grub works well before i install the theme and im using Bios + MBR can some1 help me? plzzz have a good day!