I just [clean] installed the newest paid version of ZA internet security on two WinXP computers. One computer works fine, the other upon shutdown I get an error message; "vsmon.exe . . . could not read 0x761a1575" ZA seems to work fine, scan, updates, etc. This is an update not an upgrade. Previous version was 11.0.780.000. I "chatted" with ZA tech support today and they suggested I reinstall the older version. Both are XP computers, the same amount of RAM and both about the same speed. I used ZA's clean uninstall. Any suggestions? I did a second clean install - the same results.