Windows 10: MOVED MY C DRIVE CONTENTS TO MY D DRIVE AND NOW MY LAPTOP WONT RUN PROPERLY AS D DRIVE IS...

So long story short with my laptop I moved most of my stuff that was on the c drive to my external hard drive which is the d drive and now my laptop doesn't recognise use my hard drive and therefore it won't allow the laptop to run properly as it' says the location is unavailable. Please I hope someone can help because I don't know what to do to get it back to where it was. Also side note I don't have a backup as it was off. So yeah please and thankyou to anyone that can try to help please hope someone can point me in the right direction. My laptop is a lenovo that you can use as a tablet or l

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What to move from C drive to D drive

Hi,

I have a laptop with a 118GB SSD C drive and a 920GB HDD D drive. I have only a few megabytes of space left on my C drive so I need to start moving things from my C drive to my D drive to free up space. However, I have no idea what I can move to the D drive.
I already store all of my documents on my D drive so I can't move those. Should I move the program files? Would that slow down my apps on startup?

Many thanks for your help.

 

MOVING FILES FROM C TO D DRIVE

I've been trying to move my folders from C drive to D drive to free up space but its telling me the folder can't be moved here as there is a folder in the same location even when i delete said folder from D drive.

Any suggestions as to what i'm doing wrong please

 

Moved game from drive C to D and it wont open

I recently got a new drive and I decided to move one of my games from my C drive to the D drive and the game wont open, I tried with another game like minecraft and the same happend! Please someone help me!!!