Para excluir as parções de OEM
1) hit the start and R buttons at the same time and you will get the run window
2) type diskpart and press enter
3) type list disk and press enter
4) select the main disk(usually the largest one)...so if your main disk is disk 0, type "select disk 0"
5) Once the disk is selected, type "list partition" and hit enter
6) Your "hidden" paritition will be around 4400MB to about 5000MB. In my case it was partition 1.
7) type "select partition 1" and hit enter
8) type "delete partition 1 override" and hit enter
You can then do whatever you want with this space, you can turn it into another primary parition, you can use acronis and merge partitions, etc
The disk and partition numbers I used were for my system, please be careful as the info on your system could differ.
Recurso de aqui
Se você quiser apenas desinstalar softwares pré-instalados, use Revo Uninstaller ou Total de desinstalação