Liz, this is what I found out "The HDD is a regular 2.5-in 5400 rpm SATA drive with 80, 120, 160, 250, 500 or 750 GB. A number of different drives have been reported so far: Seagate ST980811AS and ST9120817AS,[29] Western Digital WD1200BEVS,[30] WD1600BEVT, WD7500KPVT, Hitachi HTS543212L9A300,[31] Hitachi HTS543216L9A300, Hitachi HTS543216L9SA00, Toshiba MK1655GSX and Toshiba MK1652GSX." from [http://en.wikipedia.org/wiki/Acer_Aspire_One#Storage|here.] No, you will not have to change your processor. The HDD are supported by your current system. Hope this helps, good luck.