Hi, I am new to Prevx 188.8.131.52 and liked it enough to purchase. I just started using Returnil 2010 on my Vista 64 bit system and everything was fine, All of a sudden my system froze and i received a warning that Prevx was trying to scan, not enough memory. It tried to give me another warning as it was shutting down. i could not see what it said. After rebooting my system windows security warning told me that Prevx was not showing any info. I rebooted again and everything was happy. I un-clicked Prevx auto scanning at a specific time and left all others checked. I am not sure if anyone else has experienced this problem? Thank You In Advance, your Tech Support has been out standing.