boot problem

I have a Pentium II 350 with 128 me of RAM and a primary 10 gig, secondary
20 gig drive. I installed QNXRTP on the C drive and I get:
/. diskroot not found
unable to start devc-con.
I tried it on the D drive also. It installed O. K. at work for a new
project I am working on, but I am having trouble at home.