I have a lot of zipped files on my pc. When I use Windows Explorer to view a folder containing a lot of zipped files, it takes a LONG time to open. I believe this is because Windows is traversing through these zipped files so it can display them as folders. I found a way to configure Windows to not do this. At the command line, enter:
regsvr32 /u zipfldr
Now Windows Explorer opens all folders very quickly.
If you want to undo this, at the command line enter:
I found the solution at http://oakroadsystems.com/tech/winxptip.htm#AssocZip.