my laptop is CQ40-115AU bought around 2009

I was told it is common with AMD CPU but it just got out of hand lately with HIBERNATING during installation of Microsoft Office 2010

I tried installing grano.la app with its default setting but still same.

the i tried DISABLING hibernation (cmd> powercfg -h off)

then managed to get MS Office installed but powered off during Windows Update

I'm just asking around if theres some sort of cpu scaling software so it will dissipate less heat before resorting to convert it to desktop.You might be able to go into the BIOS and have it set to a green setting which will slow it down and make it run cooler. I had to do this with an old Pentium III 600Mhz that had the option to run it at 500Mhz as a way to boost BATTERY life, but it also made it run cooler. When the 10+ year old thermal compound was pretty dry, I did this until I had time to go in and CLEAN off the old and apply new compound. Now I still have laptop and it runs fine at 600Mhz without overheat.I know Windows will hibernate if your battery is low, but I don't think it does when overheating.  Usually your system will just CRASH or turn off. So is your system turning off, hibernating, or both?
I wonder if one of your buttons is malfunctioning and telling windows to turn off or hibernate.
Check the 'change what the power button do' in power options and turn them off.
Get speed fan and take a look at your temps.   You can also use this software to help keep your system cooler.thanks davelembke or that bios setting on cpu speed and skeen on speed fan software. I'll try that when my brother brings back that laptop and update.