I believe there is nothing to do one with the other. The EZdrive is a piece of software that \"fools\" the computer bios in accessing hard drives that are larger then the permitted capacity allowed by older computers that carry old bios chip in them. Such as a 5 GB Hard Drive on an old 486 processor computer.
The .DLL problem is another issue. There is \"regsvr.exe\" or \"regsvr32.exe\" (on NT or 2K) which register and unregister DLL\'s. It seems to me like you have unregistered your DLL improperly.