Is this an issue of unzipping the folder you downloaded, or that the files are now extracted and the .hak tags are being unrecognized?
Recently updated to Windows 7 myself, I was show this site by my computer-savvy father:
http://www.spoon.net/ToolsI personally use the 7zip download and then that website tool to emulate 7zip extraction. You need to do it a bit more manually, but if it's extracting the files as an issue, this site can pretty much replicate the tool you need.
If that's not enough help alone try to be more specific what's not working?