I had the problem of losing virtual keyboard, auto-cap, word completion, fn/shift lock, symbols and all that after trying mscim and google-piyin. Removing said applications did not restore the above functions, nor did restoring factory default settings, nor pulling out the battery.

What did finally restore the functions was using dpkg to purge the mscim and scim configuration files. The configuration files remain even after you remove applications using the application manager. To see if you still have them, open a terminal and type

If the start of each returned entry has the letters rc, it means that configuration files still exist (if there are the letters ii, it means the applications are still installed, you should remove them first using the app manager, apt-get or dpkg)

If you have these configuration files,
replacing x with scim or mscim or whatever (I purged libscim8c2a as well just to be thorough, even though just purgin mscim and scim solved the problem).

Reboot, and hopefully your virtual keyboard etc are restored.