The PC version is heavily stripped back, and not a patch on the console versions.
Awesome game, but ludicrously difficult in places, and with 2-300 tokens to collect in order to get the 100%, they should get marked on the map as you go.
For sure. Once you get those hint markers they should turn red, or better yet, dissapear.
I bought Spiderman 2 for Xbox and it runs really well...I'd recomend that, if it's possible.