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.