First of all I want to thank everybody in this thread for contributing to the solution of this problem. I followed the advice here and on this page to make finally install WinXP from scratch (however, since I got my M400 without any recovery media and an empty HD, I was not able to use my legit OEM key ). One note: There is not AHCI setting in the BIOS, but one has to set the RAID ARRAY to 1RAID-0 (it's actually in the manual but imho an easily overlooked detail). (Maybe a little late) Download the drivers from support.intel.com (Download Center -> Network Connectivity -> Intel Desktop Adapters -> Intel PRO/1000 PT Desktop Adapter). Unpack the file (current version is 14.0) and select the PRO1000\Win32 directory in nLite. Note: It doesn't really matter which PRO/1000 driver you download, they are all the same and XP actually recognizes a PRO/1000 PL.