Firstly, click Caps Lock to turn it off 

Secondly, this would probably be better suited in the hardware forum

Thirdly, which hardware, exactly, are you using? Temperatures will vary from piece to piece, so it's hard to say if it's just idling properly or overheating.

Fourth, and finally, the colder is usually the better. People use liquid nitrogen to cool down processors to -200C or so when they're overclocking them, but that's a short time affair. Colder is better, but the 40C region is absolutely fine for most things. Some GPUs are rated to operate at up to 120C, and about 60C is recommended for hard disk drives. So you should be absolutely fine.

Temperature benchmarks

It's consistent with their tests, so all should be good.