Yeah thats okay then, Shadows do use alot of resources.
38 degrees is fine.
As for overclocking, it would make your CPU life shorter yes, if you didn't have sufficent cooling of course, but if you have, you wouldn't notice the difference in life span, and so woudln't do hardly any, if at all any damage, since they are capable at running at that speed anyway! The manufactuers just don't to release a slower chip compared to faster ones which might be about the same...
I dont know of a program though, but some motherboards come with programs to make overclocking easier.
I hope this helps