Recently I lost the ability to expand zip files as compressed folders in Vista. a quick search of the web and I found this:

1. At the start prompt enter “cmd /c assoc .zip=CompressedFolder”
2. If necessary, Open regedit, navigate to the above path and delete the UserChoice node
   [-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.zip\UserChoice]
3. Restart Windows

remember editing the registry can be dangerous, so always backup first or create a restore point.

Source

One of my clients has just been hit by this phishing virus, purporting to be a UPS Message – beware

Trojan disguised as UPS delivery note
Joy Persaud July 16, 2008
Panda Security is warning email recipients that a series of messages purporting to come from package delivery company UPS may in fact harbour the Agent.JEN trojan.

One option I find quite useful is to use the right click SendTo option to edit a file in Notepad, to do this you add a shortcut to notepad.exe in the SendTo folder in explorer.

To find your SendTo folder tyoe the following in the address bar of Windows Explorer

%APPDATA%\Microsoft\Windows\SendTo

then right click and add a shortcut to c:\windows\notepad.exe