How can I dual-boot Windows 7 with pre-Installed Windows 8.1

Hi, I have a Toshiba Satellite C55-B5362 with pre-installed Windows 8.1.
Make DualBoot Windows 7 and Windows 8.1 (both 64 bit), so, I don't know how to do this. If I set BIOS to CMOS and Install Windows 7 disabling Secureboot, I will lost all the pre-installed Windows 8.1 and the OEM licence.
and other question... if the upper is not possible. Okay. I will delete Windows 8.1 and Install Windows 7 permanently until Windows 10 is released, but.... If I have Windows 7 with CMOS BIOS and SecureBoot disabled, then supposing that I could have problems with Windows 7, and I want to upgrade to Windows 8.1 again, and supposing that I have a Recovery Partition backed in a USB drive, what can I do for re-install OEM Windows 8.1 and the licence.
Thanks.
Solved!
Go to Solution.

As I said above...
..you will need to install essentially all of them to make that laptop work as designed.
..install the TVAP before any other Toshiba utility.
-Jerry

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ส่งจาก จดหมายของ Windows
จาก: Pat Willener
ส่งเมื่อ: จ. 5 มกราคม 2558 6:15
ถึง: thang dinhvan
How can I print a file with mixed page orientation in windows 8.1?
reply from Pat Willener in Adobe Reader Touch for Windows 8 - View the full discussion
I have a win 7 and a win 8.1 computer. I have a file which contains both landscape and portrait pages. The file prints correctly with the mixed orientation from the win 7 pc, but will only print with either landscape or portrait on the win 8.1 pc.
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