From the sounds of it, I can't verify this right now, but you problably hooked up a system specific Intel Mac OS X 10.5 install to your iBook. Boot Camp will definitely not run on your machine, but many of those other applications should be compatible with your iBook, unless you copied them over from an Intel Mac that shipped with 10.5, or attempted to use a 10.5 installer disc which has a Mac model name on it to install the applications on a hard disc and then attached it to your iBook. The do not enter sign on each application typically indicates PowerPC applications which won't work on a 10.7 machine because 10.7 lacks Rosetta. It logically could indicate Intel only applications which won't run on a PowerPC machine such as the iBook. Your machine is from the 41st week of 2005, which which would indicate it is compatible with all versions of 10.5 that come on a black CD outlined on my tip
https://discussions.apple.com/docs/DOC-2275
Grey Mac model specific, and Update discs and OEM discs will not run on your iBook that say 10.5. That tip also references which Windows systems can run on the iBook, but I'm unsure if any can access data from a Boot Camp partition without networking directly to a machine using Boot Camp that has an Intel CPU on a Mac. Lastly, you can't get an Intel CPU onto an iBook. If you are lacking any Intel Macs presently, a used or refurbished one may be within your budget*:
http://www.macmaps.com/usedrefurbished.html