Clean install windows 8.1 on Lenovo y510p

There are many reasons to clean install windows especially for Lenovo y510p users. Straight to the topic, to perform a clean install you need a windows 8.1 Single Language iso file which can be downloaded from torrent sites. In my opinion it's not illegal to download the iso file since Windows includes in your laptop price. I'm not posting the torrent link here but you can check this hash in google to find the iso file " DFDE67503F4E625EF6E7FED43DA8A5766F3D2B3E ". I recommend downloading it from " piratebay " but beware of torrent sites. Once you download the iso, you have two options:

1 - Burn it to a DVD & install (or)
2 - Burn it to a USB drive & install

Download Windows 7 USB/DVD Download tool & install it.

Download from Softpedia

Select Browse & select the iso file where its located

Click next

If you want to burn it to a DVD, select DVD or if you want to burn it to an USB drive select USB

Select begin copying & wait untill the process finishes.

If you are planning to install through USB , shutdown the laptop & press the novo button

Select BIOS setup, go the BOOT tab & Enable USB Boot.

Reboot the laptop, press f12 once you see the Lenovo logo to enter into the boot menu & select the USB device .

That's it now you can install windows with this product key " Y9NXP-XT8MV-PT9TG-97CT3-9D6TC "

Once the installation process finishes, Run the command prompt as an administrator and type 
slmgr /upk   to remove the product key & type SLMGR /IPK XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

where XXXXX-XXXXX-XXXXX-XXXXX-XXXXX is your product key

To know your product key which is embedded into BIOS , Download & install 64 bit version of read write everything from here Download from Softpedia

Run it. Click on the ACPI Table button at the top. After that click on the MSDM tab. Your BIOS's product key is at the bottom.

that's it.

Sorry for my English.