After I upgraded to Adobe Reader X, Texnic center started throwing up an error:"[DocOpen("%bm.pdf")][FileOpen("%bm.pdf")] Cannot execute the command."
Digging up a little on Adobe DDE, I found a solution here: http://forums.adobe.com/message/3301219#3301219
Here is the fix: Build > Define Output Profiles > Choose ‘LaTeX => PDF’ > Viewer tab. In three locations where ‘acroview’ is the value, change it to ‘acroviewR10’ and you are good to go!