Hi there,
   Assuming that you have Boinc already installed and functioning with stock applications, then the AK_v8 x64 version downloads, in the downloads section, will likely be the ones you're after.  Bear in mind that if you are running boinc v6, I'd advise running your WUs down first by setting 'no new tasks', to avoid dumping WUs marked higher than 5.28.

If you are/intend to run astropulse there are instructions & help available via the forums on main, how to appropriately modify the app_info.xml (and even make MB Wus  show up marked as 6.03 if it really bothers you, though there's no functional difference).

Another thought that comes to mind, considering the OSes you mention, is (I beleive) Boinc is not supported to install on servers configured as domain controllers, though I'm told they may be working on something for that.

Jason

is there any chance to run 2 xeon proc with XP x64 ? and would it be good ? the motherboard chipset is Intel 5100 MCH + ICH9R

and friend of mine ask me to ask is there  modif. application for FreeBSD x64 ?

Best Regards
Archangel

Yup, my dual Xeons started on XP before I upgraded to Vista. Just note that it has to be XP Pro to recognise dual CPUs - XP Home (if they do that in 64-bit) is limited to one CPU.