The game has many bugs, if your playing it on Win2k and WinXP. Win 98 and Win ME don't have many.
There are workarounds and a patch, for all the big bugs. I run the game with out the patch, on an ME system, so I don't really have any problems.
There's are posts on the BEST TIPS thread, (page 4 ) about Win2k and patched vs. unpatched.
Another good site to check for WinXP problems is here:
the WWHAP