If you've forgotten your Windows 7 password and don't have a CD available, performing a factory reset can be a bit challenging but possible. Here's a detailed guide on how to factory reset Windows 7 without a password or CD:

1. Restart your computer and continuously press the F8 key during startup to access the Advanced Boot Options menu.
2. Use the arrow keys to select 'Repair Your Computer' and press Enter.
3. Choose your language and log in with an administrative account (if prompted).
4. Click on 'System Restore' and then 'Next'.
5. Select the operating system you want to restore and click 'Next'.
6. Choose 'Startup Repair' and wait for the process to complete.
7. Once the repair is done, restart your computer and you should be able to access your system without a password.

It's important to note that this method may not work for all situations and it's always recommended to seek professional help if needed.