Why won’t any WordPress themes work?

Question by Mr. Horsepower: Why will not likely any WordPress themes function?
I was looking on here http://www.1stwebdesigner.com/wordpress/… for cost-free wordpress themes and I discovered a few that I liked when I tried to add them and set up them and none of them worked! Everytime I add one I get an error like this Deadly error: call for() [function.require]: Failed opening essential (then my domain identify) and many others.
Why does this preserve happening? I contacted the hosting and they stated its something with the themes not there web hosting.

Greatest solution:

Solution by Groundskeeper Willy
file permissions the probable culprit.

check out the themes directory, make positive permissions are defined as 755 (RWXR-XR-X) on the topic folder recursively.

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