"Little boxes on the top"? If this is like this:  it reminds me of a problem that stymied me a couple years ago. It may be corrupt fonts. a bad video card, video card driver or as in my case a bad motherboard. Seems the motherboard is always the last thing checked for corruption. I could be way off here, I'm not sure what you mean by "little boxes" showing up but it reminded me of my pain in the neck so I thought I'd share it