I presume that you have a router that you use to connect via wireless? If so, get an ethernet cable, plug it in and do sudo apt-get install ndiswrapper. Rather than have people on this forum try to guess what compile errors you have, i suggest just googling for the error. For something as fundamental as a compile error of ndiswrapper, I guarantee that countless other people have had the same problem.

Also, when you downloaded ndiswrapper from sourceforge, did you not notice the list of pre-required programmes? Download all of these and install them and then try and install ndiswrapper, but the best option is find a router and plug in the ethernet.

Also, putting the subject of your post as "What am i doing wrong?" is not very productive. Next time be more specific......

Man you nailed it. What an answer! You are right ON EVERYTHING. Now, the only problem was that the router is way too far from me. I gotta work it! But that you said about gatting package and see the needed programs opened my mind! I didn't even know that. I think that your answer is targeted to a newbie like me, not like other responses that, even though were excellent, they seemed targeted to somebody with more knowledge!

Anyhow, you nailed it...

Thank you!

Haha. No worries..