Studio XPS 435mt - Software fan controllers? Speedfan doesnt work...

Hi

Im just wondering before i try an hardware upgrade, if I can speed up my fan just using software.

Speedfan used to work on my old PC, but doesn't seem to on this one.

PC is not overheating or anything, just want to prolong its life a little.

Im not worried about noise, I just want to ramp it up a little more when playing games, video editing, etc.

Thanks in advance

Andy

Vista 64, 6GB RAM, 1TB HD, Radeon HD 4600.