My friend has a bit of a problem, all her files have been encrypted and I figure if anyone knows ittl be someone from 4chan
thats the cryptolocker trojan/virus (other variations like cryptowall) silently encypts valuable files (dox, doc, txt, jpg, png, bmp, etc) and holds them ransome. if you don't pay up within a specific time frame the files remain encrypted and can't decrypted due to the method used to crate them. with the time limit is exceeded, the special key to decrypt files is erased from the criminals server at which point your files are lost forever. sad part is even if you pay up there is not guarantee that they will send you the decrypt key.
at this point there is no way to get file files back without that key. most have just taken the lost and moved on.
Her PC was infected by malware that encrypted her files (making them unusable), and they are trying to sell her the password to decrypt the files (making them usable again).
Also removing the malware with an antivirus program will not decrypt the files, perhaps it's not even possible (it depends on the malware).
Perhaps someone more knowledgable can give proper instructions, I never has a virus problem.