I have a problem with CAST installation.

I have installed NX 8 and CAST both on my system. My NX8
is working fine but whenever I click on my NX8
documentation, a blank page is opening in internet
explorer and its a empty page. I couldn't see anything in
the page even though cast is installed properly.
I feel that there might be some problem with linking but
I'm not sure.

I have tried installing cast 7.5 and I end up with same

I hope I can get a solution for this.