I want to activate my photoshop CS5 on another PC as the previous one crashed and i cannot log in and deactivate the license
now if i install and enter the serial number, when I try to sign in with my email address it states that my serial number is active in
two other systems...how do I go about de-activating it so that i can use it on the current PC.
You need Adobe Customer support help. User here do not work for Adobe. We do not have access to Adobe Activation servers databases. Use Adobe Chat help or call their customer support for help activating you CS5..
You will need to contact Adobe Customer Care, and they can deactivate it via a phone call or online chat. See Activation and deactivation troubleshooting
You will need your serial number,which you can find on your Adobe profile page; click on the "Plans and Products tab, and select "View your products".