Well, I have PeppermintOS installed on another SDHC card and when I went to writing Aids section of OpenOffice.org options I found out that in "available language modules" menu there were these Voikko-modules enabled: Finnish language spellchecker (Voikko), Finnish grammar checking (Voikko), Finnish language spellchecking (Voikko).
Why is it that I don't have those modules at all in my OpenOffice.org options in PCLinuxOS? Aarrggghh, maybe I should give up! This is just giving me bad headache. Thanks anyway all of your help so far, Travis. If you or somebody else have some new ideas concerning this issue I'm always ready to listen.