|It's a laptop therefore it doesn't have a video card, it has an integrated graphics chip. 70C is nowhere near overheating for the GPU, 50C is nowhere near overheating for the CPU.|
Notice the TJUNCTION temp for your CPU is 105C:
The max temp for the desktop version of the GT420 is also 105C:
If you're concerned, just blow the cooling vents out with compressed air & be done with it.