Ex HDD became my Local Drive C/ & My Account Permissions are Affected

Good Afternoon, This is a Modified Corrected Post
I have (2) Problem' both related:
Ex HDD Has Become Local Drive C/ and All My Profiles, Account’s and Permissions and are also affected, My Account's Profiles and Permissions have changed

1 ) I Had a Western Digital HDD 1 Terabyte with Four Partitions on it
I was trying to Create a Re Bootable Disc (USB) I must have clicked the wrong Drive Letter Instead of the Bootable USB,
It seems I have moved all the contents and all the Data in the Four Partitions together onto My EX HDD TO its reading:
Local Drive (C://) 991.9GB and free 764GB (this is roughly the bulk of the remaining space left on my Western Digital Ex HDD?

The other Partitions s on there were

(:F) 31.1GB and free 30.7 GB was Named Movies TV and Video

(G:) Was all MUSIC Had all my Music files on it I moved them two weeks ago so I could make it the Kaspersky Scheduled Back-up Partition - now its UN-Available and Empty

(H:) EBook’s and Pictures’ is now - UN-Available and Empty

(i:) The Vault was a 300 GB Backup UN-Available and Empty

That Re-Bootable USB I created worked and is named: “WINDOWS 10 BOOT (J:)”
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2 ) All My Account’s Permissions and Profiles have been Affected
Please See Screen Shot ‘s
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Domain=DESKTOP-HGV5LB2
FullName= Dasha <--------- Is Still Showing on MY LOG-IN Page as Dasha

Name= User <-------- This was always Dasha_Local Administrator Account' before the Ex HDD issues was my Main Operating Account

SID= S-1-5-21-198176421-3910027260-4293273129-1001
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Name= SelwynBlondie <--- Local Account but does not always appear in User Account
FullName = NONE

SID= S-1-5-21-198176421-3910027260-4293273129-1004

Dasha as Administrator Is Only appearing in C/Users/User/Control Panel/ User Accounts” I hope Somone can help me Please In Anticipation Dasha

CountMike said:

Did you clone old disk to new one ?

No Mike it was a new USB it was the first time I had done this as we have lost the Original Disk
I just want to sort drive C out and relocate the 700 GBs then Create the Partitions again ?
Thanks also to Barman58