Hi amspire
Thanks for the help. Could you expand on Making a windows 7 ISO. Will I need to buy a windows 7 installation disk? I only need the VM for a month.. I need to use a software that's not compatible with windows 10 to do my dissertation.
Microsoft used to have the Windows 7 ISO's available for direct download from the digitalriver.com website, but they killed it with the release of Windows 8.
However, you can get the same files from
http://mirror.corenoc.de/digitalrivercontent.net/ . These are torrent files, so you will need uTorrent or similar.
I would go for the file X17-59186.iso which is also en_windows_7_professional_with_sp1_x64_dvd_u_676939.iso.
You can keep Windows 7 running for a few months without a key or activation. It will initially have either 3 days or 30 days before activation is required, but open a command (cmd) window with Administrator permissions and run this command
SLMGR /rearm
This command will give you another 30 days. You can run this 3 times so you can get 120 days without activation.
This command is documented by Microsoft and is intended for trial versions of Windows. There are no illegal hacks involved.