Even with the correct driver, the Dany PC 901 may refuse to cooperate. Here are the real fixes:

The Internet Archive hosts thousands of old driver CDs. Search for “Dany Webcam Driver CD ISO.” Download the ISO, extract the ZIP contents using 7-Zip or WinRAR, and locate the Drivers/PC901 folder.

Once you have a working setup, do not lose it again:

Also, run Double Driver (free tool) to back up the entire driver as an executable installer.

Cause: You downloaded a 32-bit driver for a 64-bit Windows, or vice versa.

Fix: Look inside the ZIP for separate folders: x86 (32-bit) and x64 (64-bit). Use the one matching your OS.