comp idles when Internet signal drops

My computer running the Windows 7 7600 32 Bit OS, and its processor is AMD Athlon(tm) 64 x 2 Dual Core 4800+ 2.5ghz with 2.00 GB Ram.
I want to prevent internet dropping while I'm away from the computer. How can i do? Everything is fine while im on the computer and surfing the web, etc...

You should go to hardware, and find your networkcard with rightclick. Then choose properties, and go to energy tab, set "can save power" option off. Good luck for you.