Augh crapola, I'm so dumb (and psycho).
I uninstalled Photoshop because all my .psd and .jpeg files were acting up somehow. So... I got rid of Photoshop so I can see if re-installing the sucker would solve the problem. The problem is, I have forgotten that I had lost the CD long time ago.... o_o
I do have a copy of Corel Draw and Photopaint, but the menus are in Korean and is really uncomfortable...
Eh... whatvever~