having problems with the display resolution with virtual box
install this in your windows 7 virtual machine and you are done!!!
https://mega.nz/#!3ANxWazC!H9p-qNXjCANuk8EY3g6drEd5UkhGvcrh-rl_Ok8-k3Y
and this
https://mega.nz/#!aF0AwIxQ!A_tFNzj9-bs1h3wUra99j3UKXvBYsbUKsP_2xZNSN40