I am using Windows 7 and Sourcetree 2.x. Previous answers on this forum were not helping. I uninstalled Sourcetree, removed all Atlassian and Sourcetree directories in localappdata and in c:\program data, deleted everything I could in localappdata/temp (there's stilla file in use in use called "1"), and rebooted. Same thing, "Sourcetree has stopped working.
The Windows 7 Event Log shows 2 errors, Application and .NET Runtime. I tired poting the event log entries but was not allowed to do so.