Thanks to all who responded to my query. I disabled my McAfee anti-virus and PU works fine now. Just a pain to do, and I will have to remember to enable before going back to the web. SUM below. >I have recently installed Win 2000 Pro. Everything works fine except >Projection Utility. PU starts, then just hangs. Task Manager says it is >not responding. Is there a patch I should install? I'll be glad to >SUM. Thanks for your help. Christa Hay, Eric A. Holt and Heather Goldman suggested disable anti-virus - worked for me. I didn't try any of the following. Joe Noble suggested a program called Tralaine in place of PU Robert Phillips: AV asked me to insert the Microsoft Office 2000 CD and now it works Suman Giri suggested Maybe you are missing one of these. exprojections.dll in bin32 mapprojections in Lib 32 external_projection in expro Gred Slutz migrated to 8.1 and now PU works fine Margaret Gooding states There is a projection utility patch on ESRI's web site Glenn Larson