I've had CS3 on my PC for years now. It's suddenly acting like it was never activated. I tried activating via internet - it said Error code 194:13 Unable to activate. Try by phone. I tried by phone - it told me my request code didn't have enough digits. What the heck? Anyone else know what's going on or how to resolve this?
Start by running the cleaner tool and reinstall:
Make sure the permissions on the required folders are intact and no security stuff is getting in the way. For anything beyond that contact support by web chat.