Proceed at your own risk. This guide is for educational and legacy purposes only.
A: You are likely trying to install 64-bit on a CPU without 64-bit support or with less than 2GB RAM. Use the 32-bit ISO. iso file windows 7 32 bit
A: Yes. You can install without one (30-day trial), but it will eventually nag and limit personalization. Use your genuine key. Proceed at your own risk