I have bay the Pa 3553 few days ago in Croatia, the laptop have no preinstaled OS and I have instaled the Vista 32 bit Ultimate SP2. With PC was not delivered CD/DVD with drivers, strange! So I hve downloaded them from FS support site and try to instal them all. Sata HDD and DVD is in vista show as SCSI, I do not know why! Drivers are out of date and specialy problem make the graphic driver because ATI Catalist regular driver pack do not cut the hardware of this piece of cr..p! Coller is loud as Iron Maiden on concert and PC heat as hell! HDD is slow as IDE hdd and make strange noise when PC is on, but the heat is like in the baker oven!Do not purcase this PC!!!!!!!!!!!!!!!!!!Sorry for bad English!