You might want to see you BIOS and acheck if there is an option about using UEFI or Legacy Bios. Choose Legacy and install BT5..Otherwise, you might want to erase all partitions using Gparted.
Delete all partitions and Create a new partition with filesystem ms-dos. Then apply changes..Now the new partition is a MBR partition, not UEFI..Then start installing all OS you want...
You can do that under your own risk..This method has been tested in some spanish forums with ubuntu distro live CD and gparted..
Again, you can loose all data (well, if no personal data still saved it would not matter)...Also reporting when installing again Windows 7, they had the GPT partitioon table back and the rest of distros installed became a headache...They recommend installing Win7 from a USB...
One of the posts come from Lenovo Community (Spanish) posted 06-18-2012.. ----> http://forums.lenovo.com/t5/Accesori...se/ta-p/774003
If you require me to translate it, it will be my pleasure...I'm still reading about UEFI to be able to help as much as I can..This UEFI issue is new to me, but I'm reading about it
Any comment or input will be highly appreciated..You can try it and post results..