"unsuccessful installation" !!??

I'm facing an issue with installing Skyscape progs on my ppc, I guess someone must have faced it one day...

the scenario goes like:
installing on pc, installing on ppc (that's probably called "deploying".. right?), installing -for ex.- stedmans.cab, then installing stedmans reader.cab... n' that's when it says: "unsuccessful installation of stedmans reader.. choose another location" (internal/storage card) yet whatever u choose it won't be installed (the "reader" I mean)...

what's up with that??

can anyone help me fix it?

thanx in advance for whoever willing to take the time and help...