Hello NAG, I have recently discovered an incompatibility between the NOD32 antivirus program and Labview 7.1. Yesterday I discovered the work around, so I thought I should share it with everyone because NOD32 is becoming more popular on campus and we have a free campus site license for the Labview software. The symptom is a very long delay when exiting Labview7.1 or any of the programs (VI's) you create with Labview 7.1 (30-90seconds depending on CPU speed). The CPU is pegged at 100% utilization during this time so it effectively locks up your whole computer for this time period. The solution is to change a setting in NOD32 under the "IMON, miscellaneous, exclusions" to include the Labview7.exe program. Normally this is C:\program files\national instruments\labview\labview7.exe . Labview 7.1 has a connection to internet services that allows it to be remotely controlled and somehow the NOD32 and Labview get into an argument over this connection during Labview7.1's shut down process. As far as I know, this problem does not occur in Labview 5 or Labview 8. I like NOD32, but I did not seem to have this problem when I was running the Norton-Symantec antivirus program. It probably was not trying to check internet traffic for viruses. Cliff -- Clifford L. Beckett office: 517-355-4659 Electronic System Designer cell: 517-449-8226 A411 E. Fee fax: 517-353-0789 OMM Department email: [log in to unmask] Michigan State University web: www.obl.msu.edu East Lansing MI, 48824