Microsoft doesn't offer Windows 7 ISO downloads for OEM preinstalled operating system product keys (Dell, HP, etc.)
If it came preinstalled:
Here are the Key/s to press at Boot t(new condition). Under each Manufacturer in the list below are the instructions in the respective links for you to follow on how to use their Recovery Partition
Acer – Press Left Alt + F10 Keys.
http://acer.custhelp.com/app/answers/detail/a_id/2631
Advent – Tap F10 until Starting System Recovery appears
https://answers.yahoo.com/question/index?qid=20081221054701AAJT8YV
Asus – Press F9
http://support.asus.com/Troubleshooting/detail.aspx?SLanguage=en&m=X53E&os=&no=1775
Dell – Press F8 which will bring up Advanced Boot Options
http://www.dell.com/support/troubleshooting/us/en/19/KCS/KcsArticles/ArticleView?docid=DSN_362066
eMachines: Press Left Alt Key + F10
http://techchannel.radioshack.com/emachines-system-recovery-1747.html
Fujitsu – Press F8
https://forum.ts.fujitsu.com/forum/viewtopic.php?f=64&t=39428
http://support.ts.fujitsu.com/WDB/FAQContentstart.asp?ID=233412526&WDBStatID=&INFO=SA&quest=&Sprache=en&SprachID=&SecID=&lng=COM&Todo=FAQ
Gateway: Press Alt + F10 Keys - As Acer owns them: press Left Alt + F10 Keys as per Acer eRecovery
http://www.ehow.com/how_6960920_restore-computer-using-recovery-partitiion.html
HP – Press F11 repeatedly
http://support.hp.com/us-en/document/c01867418#AbT3
Lenovo – Press F11
http://support.lenovo.com/en_US/detail.page?LegacyDocID=MIGR-4M7HWZ
LG – Press F11
https://answers.yahoo.com/question/index?qid=20090304161820AAiyvMn
Packard Bell: Press and hold the ALT key while pressing repeatedly the F10 key. Release the keys when a message displays that Windows is loading files.
http://packard-bell-scandic.custhelp.com/app/answers/detail/a_id/3068/session/L2F2LzEvdGltZS8xNDA2MjgyMjczL3NpZC90Z205SDktbA%3D%3D/~/use-packard-bell-recovery-management-to-restore-your-system-or-create-recovery
Samsung – Press F4
http://www.samsung.com/us/support/howtoguide/N0000137/6375/93514
Sony Vaio – Tap F10 until the Edit Boot Options screen is displayed
https://ca.en.kb.sony.com/app/answers/detail/a_id/35585/p/48903,49902,71663,71664/c/65,67/kw/recovery%20using%20f10
Toshiba – Press 0 (zero)
http://forums.toshiba.com/t5/System-Recovery-and-Recovery/How-To-Perform-system-recovery-Windows-7/ta-p/279643
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If preinstalled, you can also contact your Laptop/Computer Manufacturer and ask them to send you a set of Recovery Disks.
They should do that for a small cost, IF they still have them available.
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You can also borrow the exact same edition of Windows 7 Retail DVD and use your Product Key on the COA sticker to reinstall the operating system.
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And if you do have a Manufacturer's Recovery Partition on your Hard Drive and you can Boot into Windows, you should be able to make and have your own Recovery Disks from it to reinstall the Operating System in case of Hard Drive failure.
Look under Programs > your Computer Manufacturer's name > then their System Tools or Recovery Software Headings for them, depending how it is worded.
If you can not find any reference to it, contact the Manufacturer for advice on how to make those Recovery Disks.
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Or you can use this for preinstalled OEM or Retail Licenses
Download the correct ISO file and make your own disk and use the Product Key that is on the COA Sticker.
https://www.heidoc.net/joomla/technology-science/microsoft/67-microsoft-windows-and-office-iso-download-tool
Download: Windows ISO Downloader.exe
Version: 6.00
Release Date: 11 April 2018 (to be released tomorrow)
Requirements: Windows 7 or newer, .NET Framework 4.x, Internet Explorer 8 or newer.
Important: As of Version 6.00, we're adding back an experimental feature to generate links for Windows 7 and Office 2010. Generation of new links for these products is throttled, and not every download is always available in every language.
New links are generated on a first come first served basis, with users who enable the idle resource donation getting preferential treatment. If you have further questions, please use the
WinCert Forum to get in touch, so that other users can also benefit from the discussion.
And here are instructions on how to burn ISO images to disk:
http://www.snapfiles.com/get/ISORecorder.html
You change the Boot Order in the BIOS to be able to boot from your installation media:
How to Boot Your Computer From a Disc or USB Drive
Then do a clean install:
http://www.sevenforums.com/tutorials/1649-clean-install-windows-7-a.html
The COA sticker is either on the underside of the Laptop or in the Battery Compartment.
With a Desktop it is either on the side, rear or top of the Computer Case.
Using the downloaded ISO file Method may require phone Activation.
If it does require phone Activation, do not follow the Auto Prompts, but hold on for a real person to explain to as to what has been done for re-installation purposes
"How to Activate Windows 7 by Phone"
http://www.sevenforums.com/tutorials/18715-activate-windows-7-phone.html
The above method also will require you to go to your Computer Manufacturer's website > Support and Downloads Section > locate your Model Number and Operating System > then download and install the latest Drivers for it.
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Using the USB method in conjunction with the above Windows 7 download:
http://www.sevenforums.com/tutorials/2432-usb-windows-7-installation-key-drive-create.html
"How to Get and Use the Windows 7 USB/DVD Download Tool"
http://www.sevenforums.com/tutorials/31541-windows-7-usb-dvd-download-tool.html
Cheers.
