Hi All, a WIN XP PRO system was configured for a ADSL connection. details:-- modem--usb Adsl modem of chinese make (RB Comtec) the modem was configured with the user cd and shows up in device manager under "network adapters" the configuration details:- VPI-1 VCI-32 RFC 2516 PPPoE encapsulation modulation--multimode both the led's on the modem are on when o/s loads. connection process completes succesfully. so far all fine. now the problem--within 2/3 minutes into the connection a window pops up saying LSA (export version) needs to close under NT AUTHORITY SYSTEM. a few seconds later another window saying " C\windows\system32\lsass.exe terminated unexpectedly status code 1073741819 and countdown begins from 60 secs. downwards and the system shuts/re-boots. after this nothing happens and all well (at least i hope so because i have not given it much time) if i DO NOT CONNECT TO THE NET. the moment i connect the cycle starts again. i did some research and things like " sasser worm / virus/ create a hijack this log etc etc were the result a look at lsass.exe shows up win xps very usefull explanation:- folder--C:\WINDOWS\SYSTEM32, description--LSA shell (export version), company name--- microsoft, file version 5.1.2600.00 AND date created 8/22/ 2006 repeat 2006! size 11.5kb a casual perusal of microsoft KB SHOWS this as " local server authentication system. AT this point i said enough and turned to my most trusted forum and hence this long post. sure some fixes will emerge and wishing all a very good day---Venkat Do you want to signoff PCBUILD or just change to Digest mode - visit our web site: http://freepctech.com/pcbuild.shtml