Lost blending options after saving (Adobe CS3)

i am fond of putting some "blending options"thingy everytime i edit something on adobe Photoshop. but last night i found out that the blending options were gone after i save them. well it makes no sense if i am editing something but you cant save it afterall. i was pissed of. i went to sleep and this morning, when i got up, i uninstalled the whole program, ran the registry cleaner and then reinstalled it. to my surprise there were viruses detected. a trojan horse to be specific. so i ran my anti virus software, Avira and was hoping that would resolve the issue. But nahh...still same thing happened...now what?