Adobe CS4. (Do help.)

Hello there. I opened this discussion because mainly, i need answers.

I once bought Adobe CS4 and downloaded it but after downloading it, i found out that its license have expired according to a pop-up box that popped out when i click to try the Adobe Photoshop.

It happened to all the other products there and i really wonder why.

I recently downloaded one of the trials and entered a serial number that has an expired license and then i immediately uninstalled it, after that i installed the one that i bought but that pop-up box still showed up again.

I really want to use the Adobe CS4 but i don't know why this is happening to my computer.

It works in other computers.

Do help me solve this problem. Im really at a loss. Thanks

Nelle.