(Assuming you've created a System Restore Point already.)
Run "Regedit.exe" to start the Registry Editor.
Go to the following branch:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
From the File menu, click "Export" and save the branch to a REG file.
In the right pane, delete the following values:
{24D89E24-2F19-4534-9DDE-6A6671FBB8FE}
{339719B5-8C47-4894-94C2-D8F77ADD44A6}
{767E6811-49CB-4273-87C2-20F355E1085B}
{AB5FB87B-7CE2-4F83-915D-550846C9537B}
{F42EE2D3-909F-4907-8871-4C22FC0BF756}
{0DDD015D-B06C-45D5-8C4C-F59713854639}
{B7BEDE81-DF94-4682-A7D8-57A52620B86F}
{3B193882-D3AD-4EAB-965A-69829D1FB59F}
{69D2CF90-FC33-4FB7-9A0C-EBB0F0FCB43C}
Double-click "Desktop" and set its data to:
%USERPROFILE%\Desktop
Double-click "My Pictures" and set its data to:
%USERPROFILE%\Pictures
Double-click "Personal" and set its data to:
%USERPROFILE%\Documents
Exit the Registry Editor.
Open a Command Prompt window and run these commands:
md "%USERPROFILE%\Desktop"
md "%USERPROFILE%\Documents"
md "%USERPROFILE%\Pictures"
Log off and log back into your account.
The above steps will restore the shell folders to their default location. But the files needs to be moved manually from the respective OneDrive folders to the default location.