My current computer, by HP, came with sonic software but it was without dla. HP tech support told me that it was because sonic dla is incompatible with sp2. However by then they had a patch to make it work with sp2. The patch HP had was bugged, but I eventually found one at Dell that worked. So you may want to check with your computer's OEM.
I updated my CD drive a while back, and it came with Sonic DLA. Ever since, the whole computer will completely freeze up (and I mean 'freeze', as in a complete halting of any sort of movement, not blue screen) after I stick any disc into the drive.
I disabled Sonic, then I uninstalled it, then I used Install Clean Up to get rid of the Sonic Encoders, I've uninstalled the driver, and the problem hasn't abated.
I want nothing to do with Sonic anyways, and I want it gone. If you have reason to believe that this problem is the consequence of something else, I'd love to hear a hypothesis.