Software from within Windows, no. If you can find a hardware or firmware solution it's always the preferred option, since you don't want any unnecessary software running. There may be a setting in your BIOS to do it (similar to mine) or you might want to look into a rheobus or something similar for a 3 1/2" bay. If you only want the one fan controlled you don't really need the big ugly rheobus in your 51/4" bay. Alternately, something like  this might work for you, by giving you more functionality.  
		
		
		
		
		
			
				__________________ 
				I wake up in the morning more tired than before I slept 
I get through cryin' and I'm sadder than before I wept 
I get through thinkin' now, and the thoughts have left my head 
I get through speakin' and I can't remember, not a word that I said 
 
- Ben Harper, Show Me A Little Shame
			 
		
		
		
		
	 |