OK I finally found some useful info. I am including a URL for specs and drivers. According to the spec sheet the computer is suitable for 64 bit but you may be having driver problems. I you can download the program from MSFT that checks your computer for Windows 7 suitability.
If you need drivers this program will tell you. Ralph
http://www.myacrobatpdf.com/2355/acer-recommends-windows-vista-home-premium-acer-recommends-.html