Wall tape help

I am having some trouble with some of my tape seams on my walls. It is popping out in some places. This is something that my painter was supposed to fix before we moved in, but he only fixed about half of them. Naturally, the others are making me crazy. They are in my den, and a couple in my master.

My question is: How do I fix this?

I'm thinking that I can just smooth over the whole thing with some joint compound, sand and repaint. At least, I'm hoping it is that easy. Otherwise, do I have to try to strip the joint tape off, reapply it, joint compound, sand then repaint? Please tell me no :)

Terry- I thought you might have the answer to this one :)
I've got to fix it before I go on with the redeco.

Thanks for the help!!

Trish