This was posted in the Oracle Forums, not verified:
It looks like there a DLL problem (Unable to locate DLL (gdiplus.dll)) when starting the installer for u23 on two different updated W2K SP4 machines. :( u22 installer worked fine though! What's up? A bug?

I had to search for a gdiplus.dll in my HDDs and copy it next to the installer, and that worked. It looks like a bug! :(

http://forums.oracle.com/forums/thread.jspa?forumID=937&threadID=2143624&messageID=9211551#9211551