I downloaded the insanejournal uploader and using the instructions here I went to turn of the UAC but I can't find it in the control panel. I' on Windows 7 if that helps.
I did try using the uploader without that but it didn't work either.
Journal Watcher is a great alternative to the icon uploader programs out there if you're having problems installing it for whatever reason. Under the cut there's information on how to create a zip for uploading multiple icons.
On top of having a Multiple Icon Uploader, there's an Icon Archiver. So, if you want to transfer icons from one account to another, the Icon Archiver will provide you with a zip file of a user's icons. The filenames of the icons will be the icon's keywords. Just enter the screennme here where indicated and you'll get an e-mail with the link to download the zip. Save it to the desktop. Then you can upload the zip by starting at #8 below.