Need help removing windows 7, then reinstalling on a new mobo

[EmailSupport]

So i want to remove windows 7 off of my HDD and put it into a new computer. I factory reset it and everything i just need to know how to remove windows 7 but then be able to reinstall the trial version on my new computer since my current windows 7 is OEM. If you're confused about the question here is as clear as i can make it.

I want to put my old HDD into my new computer but i want to remove windows 7 on the HDD because it's OEM. If i remove it how will i be able to install the trial version and then connect the HDD into my new computer.
My new PC build is this:

CPU: Intel core i3-4130
GPU: Geforce GTX 660
Mobo: MSI H87-g43
PSU Corsair cx 500
2 X 3 GB RAM DDR3

 

[jbseven]

Follow these steps:
1. Backup all of your important data on the hard drive. it will be erased. this means all the partitions that are associated with this specific drive (c:, d:, E:, etc. depending on how many partitions there are.)
2. burn the version of windows 7 you want onto a dvd, or use an external hdd.
3. install the new motherboard. disconnect any other hard drives- all except the one you are installing windows onto. Insert dvd/external hdd
4. power on the pc and hit the boot options button (typically F8-F12; shown at the bottom of the POST screen immediately after powering on);
(if you cannot find this "press Fxx for boot menu", hit del or F2 to enter bios->boot options->change the boot order so that your dvd/external hdd is first.)
5. Select your dvd drive or external hard drive.
6. Press any key when prompted to start the windows installer.
7. You want advanced drive options->delete partition(s) on install hdd->create partition(s)->format
8. Thats about it- everything else is pretty much automated. you will want to install all of your new motherboard's drivers and your gfx card drivers once windows starts up.
Good luck!