I've uninstalled Extension Plugin for S60_3rd_MR and S60_3rd_MR SDK. I've removed emulator product pointing to S60_3rd_MR from C:\Nokia\Registry\installaionRegistry.xml and S60_3rd_MR device from C:\Program Files\Common Files\Symbian\devices.xml. I've also removed C:\Symbian\9.1\S60_3rd_MR. I don't know why, but during second installation of Series60 3rd MR, installer claims about creating S60_3rd_MR2 under C:\Symbian\9.1 directory instead of S60_3rd_MR. What else can I do?