hello, i have several windows 2000 pc's that operate as a retail cash registers. i installed nod32 on one of them and have been having trouble with it (just the nod32 machine) ever since. the point-of-sale application is in php & apache. the data is in sql server & the browser is internet explorer. the main problem is that about once or twice a day, in the middle of an active transaction, i lose all my session variables. slightly less worrisome, but just as mysterious to me, is that sometimes i get the error "this page cannot be displayed / dns server error" in internet explorer (also in the middle of a transaction). IMON is already disabled and following files are excluded in AMON: sql server log files, backup files, and data files; the apache & php folders; my apache document root, containing the point-of-sale application; and the system files specified by the microsoft knowledgebase article (the ones in c:\winnt\software distribution etc). but it feels like i'm missing something. i've even replaced the computer itself to rule out hardware problems, but the session variables are still getting lost. meanwhile, none of the other machines have antivirus software and they all run like a charm. i've looked in this forum and various php & apache forums, and googled like crazy, but have yet to find a similar situation. any ideas out there?