(re: Quest for Glory IV: Encountered a Strange Error) The problem is that modern computers are too fast for certain parts in old SCI-1 games, such as QFG4 and GK1. There are several Slow Down utilities available on the web, but there is but one that will get you past the dreaded Error 52/Swamp bug: CPU Killer, it’s available here;
Link: http://www.cpukiller.com/products/cpukiller/(http://www.cpukiller.com/products/cpukiller/)
Slow down your computer BEFORE you enter the swamp. Fight and kill the Chernovy, take the ritual, and leave the area.