SammyDawn, I think we can continue where G. stopped. We can update the USP5.1, you, me, all of us ! I just didn't quite get yours How-to from the beginning, please can you be more specific. I worked around with USP51, SP4, Win2K SP4 cd, I've extracted them all, found dosnet.inf files etc, I've read HFDeploy.htm from MS, all the svcpack info ... but I didn't catch you ... I think Gurgel updated dosnet.inf file(s) in SP4\i386\ip folder and respectively in ...\iw ...\is ...\ia folders they stand for win2k pro, win2k server, win2k advanced server, id is for win2k datacenter server. Please, give me detailed step-by-step how-to on hotfix integration and custom sp creation, cause hotfixes are different inside, there is no [Test.FileVer.Section] in some KBs etc... I just need to manage it, after that, I'm will to slipstream ALL post-sp4 hotfixes for Win 2000 Pro into pure SP4 and publish it as latest USP 5.x tanx in advance