I just had a problem uninstalling Ofice 2013 preview. It dosen't seem to live alongside Office 2010 on Windows 7 Pro 64bit very well and was causing me no end of problems with a particular application that uses Word - and which had defaulted to Word 2013 - which failed to open! I tried using the uninstall from Control Panel/Add and Remove Programs but that just hung (on item 2 of 5) for over an hour with nothing happening. As luck would have it, I had a restore from a few days before I installed Office 2013 and therefore mnage to eliminate all traces! I would definately advise making a restore point before doing anything!