certain drivers must be initialized first before other dirvers...
that line affects the load order... with DriverPacks that particular line is not addressed...
cdob is trying to establish if a known issue with DriverPacks is related to your issue...
By deleteing that line you are in effect loading the driver the same way that the DriverPacks does...
If cdob is right then we must edit the hive to address your issue
Let's not delve into that mire unless we need too... By reporting your result to the simple test we will know if we need to go there... If we do then a more in depth explanation will be provided. If not then don't sweat it since it is an uncommon issue.
there are several posts about it if you are intent on learning... i think you can search the forum for Parameters\PnpInterface,5,REG_DWORD,1 and find the related info