As of a few minutes ago I noticed that within Task Manger it said that my Adobe reader was running. Although none of the windows I had open contained anything running off Adobe. Even when I closed my browser window completely (Firefox 6.0) they still remained. It wasn't until I restarted my computer that they no longer displayed. I did find out what caused Adobe to open in the first place, it was a PDF within the Primavera online highschool course player. However, upon closing the window this time Adobe disapeared as it should. Is it normal for Adobe Reader 10.1.0 to sometimes hang even if all browsing history & other private data is immediatly removed upon closing?
Don't worry about that, if I dont remember bad that issue happened to me with older versions, its nothing important at all.
That is normal. It stays active in case you open another PDF. If it didn't, you'd end up waiting for the plug-in to start up for every PDF you open.