I have reset the router multiple times, but the admin ID and blank password do not work.....any ideas?

SOURCE: I can't reset my router.

for default login and password, http://purelypc.blogspot.com/2008/04/default-logins-and-passwords-for.html

SOURCE: CAN NOT OPEN DEFAULT USER NAME / PASSWORD, ADMIN/ADMIN

On the back of the device, There is a small reset button, Hold that with a pen for 30 Seconds, that will reset everything, Including that password.

SOURCE: can't access D-link DI-614+ as admin

Direct from the D-Link FAQ's
This reset procedure applies to the following devices:
DI-704  DI-704P  DI-713  DI-713P  DI-714P+  DI-804HV  DI-808HV

• Step 1 Power the unit off by unplugging its power adapter.
  
• Step 2 Insert a paper clip in to the reset pinhole. Press and hold the reset button with light pressure.
  
• Step 3 Power the device back on by plugging it in. Continue to hold the reset button.
  
• Step 4 Watch the lights on the front of the gateway. The M1 & M2 should come on solid. When the M1 & M2 begin to blink slowly, release the reset button.
  

The unit will reboot itself and should be at factory defaults. If the M1 light is not blinking about once per second, recycle the power on the gateway.
If the M1 & M2 continue to blink rapidly, you held the reset button for too long. Power the device off and repeat the reset procedure. The default IP address is 192.168.0.1. The default username for our routers is admin. The password is blank. If your router asks only for a password, use admin (lower-case).
The following reset procedure will completely restore the default settings on your D-Link device including your password. This procedure applies to the DI-514, DI-524, DI-604, DI-614+, DI-624, DI-754, DI-764, DI-774, DI-784, DI-804V, DWL-700AP, DWL-800AP+, DWL-900AP+, DWL-1000AP+, DWL-2000AP, DWL-2100AP, DWL-6000AP, DWL-7000AP, and DWL-7100AP.

• Step 1 Locate the reset pinhole on the back of the unit.
  
• Step 2 With the unit powered on, press and hold the Reset button.
  
• Step 3 Hold the Reset button for about 10 seconds.
  
• Step 4 Release the Reset button.
  
• Step 5 The unit will reboot. Allow 20-30 seconds before reconnecting.
  
• Step 6 The device is now at factory defaults.
  

Note: Do not recycle power during the reset procedure.
The default user name for most D-Link devices is admin and the password is left blank. 
When it says hold for about 10 seconds, don't hold for more than ten seconds or the procedure will likely fail, if ten seconds doesn't work try 5 seconds.
P.S.: If this information was helpful, please rate this solution.

SOURCE: LOGIN FAIL

at the back of the router is a tiny hole, so while router is on and working push the paperclip or something inside and hold for at least 10secs. This step will reset the router to factory settings and you'll be able to login again

SOURCE: I can't change my wireless

Try admin, admin. If no success, go to D-link and download manual, press reset button on the router for 30 sec. And reset the settings, remember to change and record: system id, access password, wireless security, wireless password.

Testimonial: "Great advice, worked in 3 seconds, many thanks!"