HELP with giant spiders and Indiana Jones boulder

[Hekai]

I think there is a serious glitch in my game. I literally cannot run. Even if I hold the shift key my player keeps hesitating and I literally clear the bridge before getting crushed. Sometimes I can break the bridge before I cross it but I either get crushed or end up in the walls and have to restart this section from the water cave where I jump up on the ladder. Has anyone else experienced this?

I have no idea if it is a computer problem or the program itself. Nothing else has run slowly. Anyone have ideas?

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I am reinstalling it, hopefully that works. If there is a place for cheats, this would be it... and there aren't any for this game.