sounds like bill wrote it himself
Thank god for independent opinions
At the moment, Windows Defender is still quite buggy. While the program still performs correctly and properly identifies / removes spyware, I would recommend not downloading and installing Windows Defender if the user doesn't want to deal with any of the known issues. Some common bugs which have been identified so far are as follows: (Keep in mind that these are only some of the issues I know of, and it is highly possible that some or all of these issues could be fixed by the time you read this.)
* The Windows Defender installer doesn't, in some cases, work with Windows which is running in a different language - other than English.
* Windows Update stumbles on installing the updated definitions by claiming to successfully have installed the updates, and then continuing afterward to pester the user about updates which are available for installation. This is a bit of a nuisance and a hard issue to put up with, in my opinion.
* The removal of some detected spyware-related P2P programs within Windows Defender may also result in the removal of the default folder for storing downloaded files. This essentially means that the user will need to back up his/her files which were downloaded from a P2P application before using Defender to abolish the existence of such P2P apps, or else the user risks loosing their downloaded files also.
Note that the list of other known issues with Windows Defender goes on, but those are a few of the major ones which I felt were the most appropriate to include in this article to assure future Windows Defender users understand the issues and bugs associated with the application. So don't be alarmed if Windows Defender doesn't update properly or doesn't run on your computer if it's default language isn't English.
The recommended minimum system requirements are as follows:
* Intel Pentium III Processor or higher (or AMD equivalent)
* Windows 2000 SP4 or Windows XP SP2 or Windows 2003 Server SP1
* 128 Megabytes of RAM (Random Access Memory)
* 20 Megabytes of free, available hard drive space
Full story
http://www.pcmech.com/show/reviews/916/2/