Help - Raq3 install. 4.0.6 fails, need to install 4.0.5

I tried to install PHP4.06 on a Cobalt Raq3 and had no shortage of problems. Turns out its an Apache problem with the Raq3's, as per: http://www.phpbuilder.com/forum/read.php3?num=3&id=106614&thread=105813 So I have to install 4.05 instead, which is fine. Problem is I've already run configure, make, make install with 4.06, which appeared to do an awful lot to the system with pages of scrolling installation notes, and I'm not sure how to start over with 4.05. Do I just delete the file structure I unzipped the 4.06 distribution to and start fresh? Does a failed install leave files elsewhere I need to worry about? Thanks in advance from someone that knows much more about Windows than linux. steve@asdfsportsamerica.com (remove asdf if you wish to email)