Kuo Kan Liang wrote: > Dear Bob, > > The question is not stupid. However, I have searched the webpage before > I install SL > and found that AMD Sempron 2600+ is a 64bit CPU.... May you provide a link? As far as I can tell, it is not mentioned in their 64-bit page: http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9331,00.html In case you have 32-bit CPU, you should install the 32-bit version of SL.