I use Adobe Reader extensively in my occupation. A few days ago I updated to 10.1.1 and soon was unable to open .pdf documents. Error message was "Adobe Reader 10.1.1 has stopped working". I uninstalled 10.1.1 and reinstalled Adobe 9.4 - it opened a few documents and then started coming up with error message "Adobe Reader 9.4 has stopped working". Adobe reader is critical to my occupation and I've now lost nearly 2 days productivity.