Noises and freezes while playing (Assassin's Creed 3)

Recently decided to pereproyti AC III. When you start, even during the logo yubisoft noises appear, as well as in the Intro. When playing some of the noise disappear, but frieze. The fact that just six months ago, all was fine. Already cleaned the comp from dust, updated firewood, checked CureIt, antivirus, I Defrag the C drive, installed a different Repack, and failed. The computer is not very good, but could the game 13-year become more demanding on hardware for six months. Video card AMD Radeon HD 7700 series, percent AMD A4-5300.