C Drive Full - Laptop only comes on to brand name then sits on black screen with dash

hello, Hoping you can help

I have a Asus running Windows 7.. recently its been lagging quite a lot..
a week ago I started having issues even just getting to websites like Youtube, and it would freeze up..
I ran a disk cleaner, defragment (which said only 3 % fragmented). I also ran 2 virus scans. both Microsoft Essentials, as well as Malwarebyes cleaner..

last night again I was lagging horribly.. when I checked My Computer. it showed my C Drive was in the Red, and veryyyy near full. Yet my Partitioned D drive showed near empty..

This morning I rebooted the laptop.. as soon as it powered up to show *Asus*. from that screen it goes to a black screen, with a dash. that's all I get..

Ive tried to remove the battery and unplug.. nothing seems to help.. im at a loss. Im hoping to get into the lappy to I can transfer and delete filoes from C drive..

Any help would be greatly appreciated..

?? Is My laptop dead in the water?? or can I fix this..

Tx for your help in advance