Jmk2141,
I am stuck in the exact same scenario for the second time. I am pretty sure Windows update service triggers the problem. My computer will be fine and then an update occurs in the middle of the night. Next time I boot I get the Windows could not complete the installation error. None of the solutions on any of the forums I have tried work. The only fix is the reinstall from scratch. After the second time, I am afraid it will happen again. I repair a lot of computers and this is the first time I have ever seen an error this persistent. I hope Microsoft comes up with a fix.