Lost your Windows 7 install disk but still have the activation key then Microsoft have launched a website which allows you to download the iso:
http://www.thewindowsclub.com/microsoft-software-recovery-windows-7
Unfortunately the link below still doesn't seem active.
http://www.microsoft.com/en-us/software-recovery
Microsoft has launched a website that allows users to download Windows 7 DVD .ISO files. The Microsoft Software Recovery website lets customers create Windows 7 installation DVD, create a backup Windows 7 DVD or a bootable USB drive.
If you are a Windows 7 user and wants to carry out any of these tasks, then you will need to ensure that you have a reliable Internet connection, as well as sufficient available disk space of around 3.5 GB on your Windows computer, USB Drive or any external storage drive.
ref:Create Windows 7 installation media
To get started, you will have to visit Microsoft and verify your product key.
This site allows you to recover and install Microsoft Windows software purchased through a retailer only.
Enter your product key, select the language from the drop-down menu and click on the Next – Verify Product Key button.
![]()
Once you have done this, your key will be verified and you will be able to download an ISO file.
![]()
You can use the downloaded ISO disc image to create a bootable DVD or USB, using any ISO burning software like for instance, the Windows 7 USB/DVD Download Tool.
If you are currently using a mobile device and are therefor not ready to download it, you will be sent an email link to download Windows 7 once you have verified your product key. This link will remain alive and valid for 24 hours, during which time, you can download the ISO file.
http://www.thewindowsclub.com/microsoft-software-recovery-windows-7
Unfortunately the link below still doesn't seem active.
http://www.microsoft.com/en-us/software-recovery