If Menu Tools > Options > Language Settings > Writing Aids
'Available language modules' is empty:
Please try my workaround, described in Bug 36285 37195 - Comment #28 [2011-06-24]
Last edited by franx on Tue Jul 19, 2011 2:41 am, edited 2 times in total.
Updating over 3.4.1 resulted in no spell checker working - apparently nothing installed (no check marks in Options/Language/)
to fix it - we had that already in broken file associations (sigh)
uninstall LO, delete folders in user/AppData and Program Files x86, run CCleaner to remove registry keys, reboot, install LO 3.4.2 RC1 again and all will be well.
Looks to me the Win7 setup is quite hampered a bit...