Windows 8.1 OEM Activation not working anymore ?

Hello,
After asking here on the forum about restoring a deleted partition which question has been solved. We run into another problem.
My sister recently infected the Laptop at a point it became UNUSABLE! The HDD kept filling up, She had over 400GB remaining (girls stuff, unlike guys, they don't download many stuff); but suddenly the HDD filled up from 400GB remaining to 5GB
And...the computer is VERY SLOW at start, it used to take just few seconds to boot, but it took almost 5 minutes to boot when it was infected. We tried many antivirus softwares, the laptop came with a preinstalled one (can't remember which one), beside this, we tried Kaspersky, Avira, Avast, Eset and other Antivirus softwares.
Most of them failed to scan C:/ Drive with a error message such as "unable to scan  drive c".
So our best option was to reeinstall the system.
I firstly backep up the OEM Activation Keys (supposedly encrypted in the BIOS). I found useful tutorials online which allowed me to show which activation key is beinf used, so I just copied it in a safe place just in cas somthing go wrong. I didn't use a thirdparty software to display the key! Just Windows tools. A thirdparty application can't be VERY trustfull in term of Licence Keys.
I then downloaded a guenuine Windows 8.1 Pro from MSDN website with a product key.
The installation went flawlessly but when I restarted I noticed Windows Wasn't activated!
I then tried to use the earlier backed up key, sadly it didn't work, windows said that I can't use this key with this edition of windows.
My questions are:
- Can someone tell me WHY can't I use the OEM Activation on all windows edition ?
- Is there any way to get it working on all editions anyways ?
- Will a full reinstallation of Windows 8.1 Non-Pro version be activated automatically by the BIOS ?
- If I buy an activation key for windows 8.1 pro, will this key somehow interfere with the one in the BIOS ?
This question was solved.
View Solution.

My questions are:
1 - Can someone tell me WHY can't I use the OEM Activation on all windows edition ?
2 - Is there any way to get it working on all editions anyways ?
3 - Will a full reinstallation of Windows 8.1 Non-Pro version be activated automatically by the BIOS ?
4 - If I buy an activation key for windows 8.1 pro, will this key somehow interfere with the one in the BIOS ?
1. No it works only for that version that is made for Preminum for Preminum not Preminum for Professional that is a different Product Key.
2. No, You will have to buy each O/S with different Product Key to activiate them
3. No, If that O/S doesn't match the Product Key for the previous O/S it will not work or activiate giving you only 30day trial.
4. No, it will not interfere it will though ask for the new Product Key from the Windows 8.1 Pro to activiate it.
So Product Keys are not tranferrable with the exception that if the replacement Windows Retail matches the previous Product Key Windows O/S version will permit the installation and comes the possiblity that you will have to reactiviate online to verify the Product key to get the O/S working.
I am a Volunteer to help others on here-not a HP employee.
Replies aren't online 24/7 because of Time Zone differences.
Remember in this Day and Age of Computing the Internet is Knowledge at your fingertips if you choose understand it. -2015-

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