Windows

The iTunes/QuickTime installer will fail with a "VBScript not installed" error on some installations of Vista. I'm not sure exactly what leads to this situation as it does not seem to affect all Vista users, but there is a relatively simple fix:

• Click Start, All Programs, Accessories then right click on Command Prompt and select "Run as Administrator"
• cd to your windows\system32 directory
• enter the following command:
  

  regsvr32 vbscript.dll

This will re-register VBScript and allow the iTunes installer to run.

Windows Vista will not work with Mac OS X Windows file sharing support by default. If you attempt to access a folder shared from Mac OS X, Vista will display a logon error repeatedly.

The problem is that Vista, by default, will only use NTLMv2 for authentication, which is not supported by Mac OS X's Windows Sharing service.

To get around this:

1. In Vista, open the Control Panel
2. Switch to "Classic" view
3. Double-click Administration Tools
4. Double-click Local Security Policy
5. Expand "Local Policies" and select "Security Options"
6. Locate "Network Security: LAN Manager Authentication Level" in the list and double-click it.
7. Change the setting from "Send NTMLv2 response only" to "Send LM & NTLM - use NTLMv2 session if negotiated"
8. Click OK

Now you should be able to access your Mac OS X shares.

You might also have this problem accessing Samba shares on Linux or Unix systems running an older version of Samba. The same fix should work in this case as well. Current versions of Samba support NTLMv2.