Exit your registry, you may need to restart or log out of Windows for the change to take effect.

(Default) REG_SZ (value not set)
NoLowDiskSpaceChecks REG_DWORD 0x00000001 (1)

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\...



Registry Settings
User Key: [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersionPolicies\Explorer]
System Key: [HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersionPolicies\Explorer]
Value Name: NoLowDiskSpaceChecks
Data Type: REG_DWORD (DWORD Value)
Value Data: (0 = default, 1 = disable messages)