The Sophos rootkit detection and removal tool is at:
http://www.sophos.com/support/disinfection/rkprf.html
Use at your own risk, but it is recommended by several reliable sources. I certainly wouldn't use any Sony removal tools, given their record so far.
Per Mark Russinovich's Sysinternals site who discovered all this:
Unfortunately, there has been some confusion with regard to the level of cleaning that antivirus (AV) companies are providing for the rootkit.
Some articles imply that AV companies remove all of the Sony DRM software in the cleaning process, but they are in fact only disabling and removing the Aries.sys driver that implements the rootkit cloaking functionality.
Unfortunately, all of the AV cleaners Ive looked at disable it improperly by unloading it from memory - the same way Sonys patch behaves - which as I noted previously, introduces the risk of a system crash.
While they post disclaimers on their web sites to that effect, they should use the safe alternative that I described a couple of posts ago, which is to delete the rootkits registration from Windows so that it wont activate when Windows boots:
1. Open the Run dialog from the Start menu
2. Enter cmd /k sc delete $sys$aries
3. Reboot
Much more detail at his site here.
let's see what kind of internet rumor we can get started here..