It's probably in the Windows\System32\Drivers folder.
I see six files from Sonic in my EMC 9 Deluxe system drivers folder, and I'd tend to suspect any of the first four as being part of the DLA component installed by Drag2Disc in EMC 9.
dlacdbhm.sysdlartl_m.sys
drvmcdb.sysdrvnddm.sys
nv4_mini.sys
RxFilter.sys
I suggest you look in your drivers folder, and if you find any of those files then remove or rename them. Attack them one at a time and you'll see which is causing the problem.
EDIT:I went back and had a look at the filter driver load order in my EMC 9, and found two of those drivers installed as lower class filters. I've bolded them above.
Since they are installed as filters, just removing the files might cause Windows to stop seeing your drives. You might need to follow the Microsoft KB article
HERE to bring the drives back,
OR if you're familiar with editing the registry you could edit the LowerFilters entry in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318} to delete dlacdbhm and drvmcdb from the filter list.
Sorry this is so complicated, but it's what sometimes happens when you try to install incompatible software.
Edited by Brendon, 07 November 2009 - 09:35 PM.
P4 @3.20GHz on Albatron PX-865PE Pro II with 2GB DDR-SDRAM, FX5900XT video, Viewsonic monitors,
BENQ DW1640, in XP Pro and Windows 7
I blame it all on Global Warming / Global Cooling / Global Staying the Same [pick one]