When I download a Picasa album, then try to unzip it with Winzip 16, it locks up my PC (I use Firefox & XP).
What seems to be the problem?
In order to avoid this problem, you should install Picasa (application) and then sync it with the account where the pictures are. You will see that this approach is more comfortable then extracting the album. Also, after you install Picasa, it will automatically detect links with albums, so in case you receive a photoshare stored on Google then Picasa will automatically get all the pictures for you.