diff --git a/src/auth/trusted/AuthSspi.cpp b/src/auth/trusted/AuthSspi.cpp
index 515271b1ec9..9cedeaccc9a 100644
--- a/src/auth/trusted/AuthSspi.cpp
+++ b/src/auth/trusted/AuthSspi.cpp
@@ -119,7 +119,7 @@ AuthSspi::AuthSspi()
 {
 	TimeStamp timeOut;
 	hasCredentials = initEntries() && (fAcquireCredentialsHandle(0,
-					legacySSP ? NTLMSP_NAME_A : NEGOSSP_NAME_A,
+					const_cast<SEC_CHAR*>(legacySSP ? NTLMSP_NAME_A : NEGOSSP_NAME_A),
 					SECPKG_CRED_BOTH, 0, 0, 0, 0,
 					&secHndl, &timeOut) == SEC_E_OK);
 }
diff --git a/src/common/isc_sync.cpp b/src/common/isc_sync.cpp
index ee2d9f82d57..62db352fa1b 100755
--- a/src/common/isc_sync.cpp
+++ b/src/common/isc_sync.cpp
@@ -2601,7 +2601,7 @@ bool SharedMemoryBase::remapFile(CheckStatusWrapper* statusVector,
 			!FlushViewOfFile(sh_mem_header, 0))
 		{
 			error(statusVector, "SetFilePointer", GetLastError());
-			return NULL;
+			return false;
 		}
 	}
 
@@ -2644,7 +2644,7 @@ bool SharedMemoryBase::remapFile(CheckStatusWrapper* statusVector,
 	if (file_obj == NULL)
 	{
 		error(statusVector, "CreateFileMapping", GetLastError());
-		return NULL;
+		return false;
 	}
 
 	MemoryHeader* const address = (MemoryHeader*) MapViewOfFile(file_obj, FILE_MAP_WRITE, 0, 0, 0);
@@ -2653,7 +2653,7 @@ bool SharedMemoryBase::remapFile(CheckStatusWrapper* statusVector,
 	{
 		error(statusVector, "MapViewOfFile", GetLastError());
 		CloseHandle(file_obj);
-		return NULL;
+		return false;
 	}
 
 	if (flag)
@@ -2672,7 +2672,7 @@ bool SharedMemoryBase::remapFile(CheckStatusWrapper* statusVector,
 	if (!sh_mem_length_mapped)
 	{
 		error(statusVector, "sh_mem_length_mapped is 0", 0);
-		return NULL;
+		return false;
 	}
 
 	return (address);
diff --git a/src/utilities/install/install.cpp b/src/utilities/install/install.cpp
index 16a55f2b0e2..1858e1800ac 100644
--- a/src/utilities/install/install.cpp
+++ b/src/utilities/install/install.cpp
@@ -665,7 +665,7 @@ USHORT IncrementSharedCount(const TEXT* filename, err_handler_t err_handler)
 
 	HKEY hkey;
 	LONG status = RegCreateKeyEx(HKEY_LOCAL_MACHINE, SHARED_KEY,
-		0, "", REG_OPTION_NON_VOLATILE, KEY_READ | KEY_WRITE, 0, &hkey, 0);
+		0, NULL, REG_OPTION_NON_VOLATILE, KEY_READ | KEY_WRITE, 0, &hkey, 0);
 	if (status != ERROR_SUCCESS)
 		return (*err_handler) (status, "RegCreateKeyEx");
 
@@ -714,7 +714,7 @@ USHORT DecrementSharedCount(const TEXT* filename, bool sw_force, err_handler_t e
 	HKEY hkey;
 	DWORD disp;
 	LONG status = RegCreateKeyEx(HKEY_LOCAL_MACHINE, SHARED_KEY,
-		0, "", REG_OPTION_NON_VOLATILE, KEY_READ | KEY_WRITE, NULL, &hkey, &disp);
+		0, NULL, REG_OPTION_NON_VOLATILE, KEY_READ | KEY_WRITE, NULL, &hkey, &disp);
 	if (status != ERROR_SUCCESS)
 		return (*err_handler) (status, "RegCreateKeyEx");
 
diff --git a/src/utilities/install/registry.cpp b/src/utilities/install/registry.cpp
index 9b6a3304d2a..c8e2e69d780 100644
--- a/src/utilities/install/registry.cpp
+++ b/src/utilities/install/registry.cpp
@@ -55,7 +55,7 @@ USHORT REGISTRY_install(HKEY hkey_rootnode, const TEXT* directory, pfnRegError e
 	SLONG status = RegCreateKeyEx(hkey_rootnode,
 			REG_KEY_ROOT_INSTANCES,
 			0,
-			"",
+			NULL,
 			REG_OPTION_NON_VOLATILE,
 			KEY_WRITE,
 			NULL, &hkey_instances, &disp);