Windows 8 BIOS activation

[Greggers]

Hello, new member here. I've been trying to figure this out for the best part of a weekend now to no success. 

 

I'm moving soon and my only computer will be an Acer S3-391 ultrabook that I had lying around. Problem is, it had a 500GB HDD full of bloatware and the drive was pretty slow to start with. So I swapped that out for an old yet reliable Intel 520 120GB ssd. Luckily I already had Windows installed so I could re-install within Windows once it was on my new laptop but here's the problem. 

 

If I want to reinstall using USB it won't work. Apparently OEMs now stick their Windows activation key in the BIOS and Windows will always check that rather than letting you enter your own. I've tried editing the PID.txt and EI.txt files in my USB installer to no success. Is there any way you lot know of to bypass the BIOS activation so I can activate using my legit product key?