There is a problem with Adobe Acrobat/Reader. If it is running, please exit and try again. (101:101)

I am getting this error when trying to preview a pdf through an application that uses internet explorer to view the pdf. I previously got the (103:103) version of this error, but I disabled the "enable protected mode at startup" option, so now it gives me the (101:101) version of the error. Also, sometimes it will give me an "out of memory" error. Any help on these issues would be greatly appreciated. Thanks!