I'd been having a host of computer issues for the last 4-6 weeks. I figured it might be related to registry to I tried a registry cleaner to weak results. Then when my anti-virus stopped downloading, it occured to me that it's registry was fucked up. That apparently wasn't the case, but I decided to uninstall, delete and reinstall.
Also, after Adobe Reader quit launching, I tried to do the same.
For some reason, Adobe updates left my reader un-functional. I did a
uninstall, delete and attempted a reinstall on versions 9 and X. Neither was
able to install, though I have the .exe programs fully downloaded. Adobe is
working on this, but I needed something NOW.
This reader
http://download.cnet.com/Foxit-Reader/3000-10743_4-10313206.html comes well recommended and downloaded and worked just fine. Of course you
want to uncheck some of the installation options like toolbar, etc. It also
tries to create it's own file, but since it is unfamiliar you may want to
create a pathway ProgramFiles->PDFReaders->Foxit so you can find it when you
get as absent minded as I can.
Foxit, also seems to permit mark-ups of files, so you can highlight some things and save those notes - a nice element.