This thread has a download for a working CA windowed mode.
(Please post your results. Include your OS (type/version) in your post.)
»»Download the attachment.
»»The picture below, and the one in the attachment show where, and what files to put into your CA folder.
»»Start up CA.
Where to put your downloaded files:
»»Windows Update (Your OS is up to date)
»» .Net Framework 3.5+
»»Complete CA files (None missing/other hack files present)
»»Direct X 9c +
»»Some may require d3dx9_42.dll, d3dx9_37.dll, and d3dx9_35.dll Download missing .dlls(In the CA folder and/ system32 folder)
»»(A long shot) You can try a smaller ingame resolution
»»Other public hack may conflict (I've tried all the MPGH ones, and they don't conflict)