Can I use an OEM ISO to install Win7 PRO x64 onto Lenovo e540

I have a new, never used, Lenovo e540 with Win-7 PRO x64
Purchased in Aug-2015, but a week later I had a stroke so the Lenovo sat in its wrapper until about Mar-2017 (this year)
The Lenovo came with a lot of Lenovo crud and following Greg Rockers mantra I was cautiously uninstalling Lenovo "extras" using Revounistaller PRO
- the washup is no boot, no BIOS ... and C:\ drive is empty (I tried recovering the C:\ partition with 2 programs)

I gave the broken Lenovo to a local significant repair shop, who installed a non-Lenovo Win-7 onto the machine again.
- cost was $200, no discs, no recovery partition ... nothing else. !
The shop loaded a lot of commercial trial-ware onto my machine
- so I have been uninstalling "stuff" with Revounistaller PRO

Now the system is unstable some Windows features have disappeared ...
... no Safely Remove and no "Eject"

Time for a clean slate ... I have wasted lost too much time already

A new HDD and a fresh install of Win-7 PRO x64 using an ISO file.
The repair shop did give me this list of "product codes" .... beyond my knowledge

Windows Product Key Information

Product Name: Windows 7 Professional
Product ID: xxxxx-OEM-xxxxxxx-xxxxx
Installed Key: xxxxx-xxxxx-7H2VR-VQ29D-xxxxx
OEM Key: xxxxx-xxxxx-xxxxx-PKRB3-xxxxx
OEM Edition: Win 8.1 RTM Professional OEM: DM

Is this enough info to use a generic OEM ISO to install Win-7 PRO x64 onto the new HDD
OR
would it be easier to buy a new OEM with new keys and start afresh ?
- a new Win-7 PRO OEM (ISO download) is cheaper ($85) than another $200 and gives me a Recovery (sought of) in the future.

From reading today the OEM: DM means the activation is stored in the BIOS but (again) my understanding is DM is only applicable to Win-8.x and later (?)
So I assume the original pre-installed Win-7 PRO x64 does not know about the DM in BIOS.
- I originally activated the pre-installed Win-7 PRO x64 online, no problems ...

I would appreciate any help :)

Yes mate first up make sure you have the key and use this to find it Product Key Number for Windows 7 - Find and See
if you use both programs then you can be sure you have the right key code now to get the ISO you need to go to this
Clean Install Windows 7 and use the download from Microsoft Software Recovery because it will request you enter the key first before you can download and if it is not right then you will not get the download and know you will need get the right key code.

Do that first after finding the key mate.

Thanks Roy I was just thinking that download I suggested would test out whether the key was correct as when I have downloaded ISO's form that sit e in the tutorial they required the key before they will let you download it.

Why did the shop install trial ware ??????

Didn`t you tell them you just wanted a clean install ??????

And what do you mean "No Bios" ???

The only key you need is on your Windows 7 COA, you said the PC was new and never used, so it should be on the PC somewhere.

Hi all :)
I am back at work full time, a contract for 3 months good $$, so not the time I have had since "retiring" in 2007
- I knew there was a reason I wake at 4:30am every day

Its very late here PM, I hope to get a few hours tomorrow to respond to all your suggestions
Thanks for hanging in there for me :)