Did you even read
Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS ?
Power down your PC, unplug and drain power by holding the power button, then as I already told you choose one of the steps to manually reset the CMOS in the tutorial. This may resolve the keyboard issue.
None of the steps I gave you depend upon booting into Win7 which is when any Resume error would appear. You just have to be quick enough with good timing to trigger F12 at the first BIOS screen before the OS is even called upon, to trigger Dell Diagnostics and then the Win7 DVD. If your keyboard won't be recognized by tapping f12 use another.
Once you do this reboot into the Win7 DVD which is provided in the
Troubleshooting Windows 7 Failure to Start. tutorial to run Startup Repair a few times and then if necessary System Restore from the Recovery options.