skg5.sys device driver

I hope this is in the right newsgroup, I use autoruns and under drivers,
there is a entry for skg5.sys, after doing a little research I have found out
it belongs to is3 stopzilla corp. I did use there trial awhile back. If I
disable this driver my machine will not boot, but if I go into safe mode and
re enable this driver, everything is ok, is this driver needed, if not how do
I remove it and still boot in normal mode? Thanks