I just got photoshop CS4 from my sister's laptop, but when I try and open it, it says "Licensing for this product has stopped working", and tells me to restart my computer. After restarting my computer I tried to open it again and got the same message. It says that if restarting doesn't work, contact IT adminstrator or Adobe technical support.
Also says to mention the error code, which is 150:30
Can somebody help me? Or can they tell me who and where to contact someone that can?
Sounds like you do not have a licence. CS4 may have been installed as I trial for 30 days more then 30 days ago.
Exactly what do you mean when you say "I just got Photoshop from my sister's computer"?
You can't just copy Photoshop. It must be installed, and (importantly) it must be activated with a serial number from a valid license.