If it came with your PC, the license is often "OEM" and baked into the installer found in the C:\Drivers or C:\Tools folder of your original hard drive.
If you previously owned the software, you might not need to find a new key. Check these locations: arcsoft mediaimpression 2 license key
ArcSoft MediaImpression 2 is "abandonware." While it was great for its time, your best bet is to look for the on your old hardware or switch to a modern free alternative that won't compromise your computer's security. If it came with your PC, the license
: Unofficial download sites often bundle malware or spyware with old software. If it came with your PC