Actually, I really don't reccomend installing manually the .dll files for the ASPI layer. You should use a program like ForceASPI to install it for you, since it can make the changes and install ALL the files necessary to have an ASPI layer. It worked for you in this case, but maybe some other program that needs an ASPI layer will not run properly.
btw, moved this thread to "Everything else PSX", since it actually has a topic
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But there is someone who remembers you
Someone waiting for a sign that leads the way to you
There is someone who will die for you
Keep that in mind when the hope fails