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It also tunes up Vista's wired and wireless traffic management elements, including 802.11n support, network speed and file copy improvements as well as some other performance enhancements to help keep us from going crazy while waiting for the OS to respond.
In the security arena, Vista SP1 allows you to use Bit Locker to encrypt drives other than the C: drive, SSL VPN tunneling, and it contains certain cryptography additions and multi-factor authentication options.
You can download SP3, copy it to disc or a portable drive and use it on multiple PCs.
The file is a large download and can be applied to any version of Windows XP Home, Professional, Tablet PC or Media Center (32 bit only).
There are a number of possible reasons for this, I suspect the main reason is that a couple of anti-spyware programs change registry values which prevent access.
Having had this problem on a number of machines, I went looking for a "simple" solution.
It also has some administrative enhancements to Network Access Protection (NAP), which is native to Vista.
This is Microsoft's answer to NAC, limiting network access to only "healthy" computers based on policies you define.