QUOTE(knight @ Mar 29 2016, 09:46 PM)
Hi Guys,
I have a big problem here. Recently, I had my motherboard changed by Dell and somehow their technician corrupted my Windows and unable to recover it at all. I had no choice but to format it.
Previously, this PC is pre-installed by Dell in Window8 system. It was like few years back. After that only I upgraded it to 8.1 and then Window10. I never did clean installation before for this PC.
My problem here is that I can't use the Window 8.1 activation Key to activate Window10. I had tried to search on the internet but I have no luck on finding.
I believe it's an OEM license that Dell is using and they may have a common licence activation. Anyone here know where I can get that? or maybe how to convert my Window8 license to Window10?
Can Anyone help me??

Hi, You can activate windows 10 using either windows 7, windows 8 or windows 8.1 licence. the steps are as follows:
1. download the latest built of windows 10 using the media creation tools from Microsoft.
2. Install windows 10, making sure you choose the correct edition e.g. if your windows 8.1 is home edition, make sure you install windows 10 home. during installation, skip the product key.
3. After installation, connect to the internet. then go to settings, update and security, and choose activation. From there, activate your copy of windows 10 with the windows 8.1 key. It should activate.
ps. since you change your mobo, there might be a concern that the key won't activate, since OEM key are tied to the motherboard. However you may still try. good luck.