Try a new pdf reader
I've been having 'issues' with adobe reader for quite a while now, including installation problems with upgrades and so on. Frankly, I just don't like using it. Today I wanted to make some notes and comments and use a highlighter on a pdf and I was annoyed that I couldn't - why not? It may be that adobe reader x works in this way... but I'm just having trouble installing it, as I say! So, a quick Google search brought me to Foxit Reader, which is a revelation - it's fast, light and with a pleasant interface - it also lets me make notes and comments, highlight areas, open multiple pdfs in tabs - I'm sure there's more, but that'll do me for now. If something works it just works and I thought I'd share it with you.