I have installed NOD32 V3 several times on PCs running both Windows XP Pro and Windows Vista Home Premium. In each case, I have noted a bug in Vista that does not occur in XP. When you go into Tools / Log Files / On-Demand Computer Scan and attempt to delete a previous scan log (by right clicking and selecting Delete) it refuses to do so under Vista. It should also be noted that NOD32 has another long standing bug. When a scan is not allowed to complete (eg, rebooted prior to completion) the log shows 'Scanning in progress' forever. It is these scans that I wish to delete since the status is not accurate. This bug occurs in both XP and Vista.