i have the same problem as another poster - install anydvd and get a "no dvd drive detected" the next day (it works after rebooting the first time but then doesnt the next day) (Vista OS) here's the filter load order: ---------------------------------------------------- Filter Driver Load Order http://www.bustrace.com ---------------------------------------------------- Upper Filter Drivers: No Upper Filter Drivers specified for this device. Device Object: LITE-ON DVDRW LH-18A1P ATA Device Lower Class Filter: PxHelp20 Lower Class Filter: AnyDVD Driver Name: pxhelp20.sys File Location: c:\windows\system32\drivers File Description: Px Engine Device Driver for Windows 2000/XP File Version: 2.03.12a [2.3.12.0] Product Name: PxHelp20 Product Version: [2.0.0.0] Company Name: Sonic Solutions Driver Name: anydvd.sys File Location: c:\windows\system32\drivers File Description: AnyDVD Filter Driver File Version: 6.1.3.3 [6.1.3.3] Product Name: AnyDVD Product Version: 6.1.3.3 [6.1.3.3] Company Name: SlySoft, Inc. ---------------------------------------------------- Filter Driver Load Order http://www.bustrace.com ---------------------------------------------------- Upper Filter Drivers: No Upper Filter Drivers specified for this device. Device Object: LITE-ON DVDRW SOHW-1693S ATA Device Lower Class Filter: PxHelp20 Lower Class Filter: AnyDVD Driver Name: pxhelp20.sys File Location: c:\windows\system32\drivers File Description: Px Engine Device Driver for Windows 2000/XP File Version: 2.03.12a [2.3.12.0] Product Name: PxHelp20 Product Version: [2.0.0.0] Company Name: Sonic Solutions Driver Name: anydvd.sys File Location: c:\windows\system32\drivers File Description: AnyDVD Filter Driver File Version: 6.1.3.3 [6.1.3.3] Product Name: AnyDVD Product Version: 6.1.3.3 [6.1.3.3] Company Name: SlySoft, Inc.