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Hello, There are two things you can try, the default password for the system should be 000000. If that is not the password if you go into the System Menu under the "General" tab there will be an option that says Factory Defaults, this will reset the settings to the default and should remove any password that is in place, but be warned that this will possibly wipe the dvr.
The DYK4500 is a DVR system and is not a Windows or traditional computer. It does not have an optical drive. You may first want to just hit enter and see if the password is not set. Try any other methods first, and if all else fails, you can attempt a reset by removing the BIOS battery and jumping the contacts for 30 seconds. This method sometimes has issues that are tough to recover from if you don't have the remote. You'll often get to a first screen that shows: HDD0 Detected, HDD1 No Device. Haven't figured out how to bypass this window without the remote. With the remote, you should be able to press '0' twice.