Today my Windows 7 x64 crashed with BSOD for the first time (I think) in over a year. Here's some details: DRIVER_IRQL_NOT_LESS_OR_EQUAL STOP 0x000000D1 eamonm.sys FFFFF88002442B57 I have memory.dmp and minidump file and can send it to someone from ESET. Windows has all patches installed. ESS was working fine for a long time. ESS Smart Security, English version, 220.127.116.11: Virus signature database: 5752 (20110101) Update module: 1031 (20091029) Antivirus and antispyware scanner module: 1293 (20101110) Advanced heuristics module: 1115 (20101116) Archive support module: 1123 (2010110 Cleaner module: 1050 (20101207) Anti-Stealth support module: 1023 (20101125) Personal firewall module: 1061 (20100607) Antispam module: 1015 (20100524) SysInspector module: 1217 (20100907) Self-defense support module : 1018 (20100812) Real-time file system protection module: 1004 (20100727) This happened while I was away from computer and I have no idea how to reproduce. However, I hope you can use memory dump to narrow down the place where an operation was made under incorrect IRQL level. Feel free to ask more questions.