while setting up eindows, error occured "the selected partition is GPT type"

[Rezwan]

My friend gave me his LENOVO Ideapad S4oo to turn his OS into win7 from win8. with making some changes in UEFI settings, I got In track. I deleted all existing partitions except One as need the documents in it! But when I select the partition or try to make a new partition.....It does not work. It shows "the selected partition is GPT type" message!

Then I tried to look for solutions over internet! But all it offered me was Solution by command prompt or third party software!
But the problem is I don't have any OS in the system. So I cannot go Through those process. Now what can I do???

Help me!!

 

[RealBeast]

I would try to see if I could access them from a portable Linux install like Puppy that can run from a USB stick or CD and does not write to the drive, then save them somewhere else.

And look at the bright side of it, you will never forget that backup is critically important. And IMO even a USB HDD is insufficient for really important data.