The problem is that you there are files in your new zip that have the same name as files in the folder where you have extracted other zips. Most likely a read me document or internet shortcut file is contained in both the new zip and the other folder.
I recommend that you make a separate folder for non font files in the directory where you extract your zips. If you get the duplicate file warning for a .ttf or .otf file, it probably means you have downloaded the same font twice.
Many sites have a generic read me enclosed with each font download zip, and several have an interent shortcut included in the zip, as well. Sometimes the read me documents contain different text, but the file name is the same. Windows doesn't care what the contents of a file are. It just won't let you have two saved files with the same place, name, and type, even if the files themselves are different. .
The exeption to this rule is for temporary files. For example, if you have a lot of Internet Favorites, and if there are site specific favorite icons, you may have several different .ico files, all named 'favicon', in your Temporary Internet Files folder. If you copy them to a permanent location, however, you have to name them individually, or the most recent one saved will overwrite the previous one.
I was able to unzip quite a few fonts without problems until I tried unzipping ''1029997404willegha.zip. I have always used the Windows XP unzipping utilty without problems until this. After selecting the destination folder I get the dialog box that reads: 'the 'folder already contains Faq.txt, do you want to: replace etc. If I check 'yes' it gives a further extention, like Catalog.url. Has anyone else had this problem.? It seems to continue with this response when I try to unzip other fonts. Thanks
VickyC