Fix for Windows 7: Goto Users -> [UserName] -> AppData (hidden folder) -> Roaming -> Inkscape -> rename preferences.xml to preferences.old (Inkscape creates a new one after succesful startup)-> restart your computer -> try launching the inkscape.
Fix for Windows 7: Goto Users -> [UserName] -> AppData (hidden folder) -> Roaming -> Inkscape -> rename preferences.xml to preferences.old (Inkscape creates a new one after succesful startup)-> restart your computer -> try launching the inkscape.