Thanks!!
I actually managed to get through that sequence by trial and error, and then the tower sequence by looking at a walkthrough. I guess I could have kept struggling through, but when your computer is running so slow that you can barely do anything, trial and error is hard.
The same thing happened with the banshee, even after I looked up the correct items to use, I still died 3 times trying to get through the sequence because I couldn't click on things fast enough!