diff --git a/src/backend/port/win32/socket.c b/src/backend/port/win32/socket.c
index 52944a0d33..130b60af22 100644
--- a/src/backend/port/win32/socket.c
+++ b/src/backend/port/win32/socket.c
@@ -495,7 +495,7 @@ pgwin32_send(SOCKET s, const void *buf, int len, int flags)
 			return -1;
 		}
 
-		/* No error, zero bytes (win2000+) or error+WSAEWOULDBLOCK (<=nt4) */
+		/* No error, zero bytes */
 
 		if (pgwin32_waitforsinglesocket(s, FD_WRITE | FD_CLOSE, INFINITE) == 0)
 			return -1;
diff --git a/src/bin/pg_ctl/pg_ctl.c b/src/bin/pg_ctl/pg_ctl.c
index d7ff3902aa..bea2470d86 100644
--- a/src/bin/pg_ctl/pg_ctl.c
+++ b/src/bin/pg_ctl/pg_ctl.c
@@ -1726,9 +1726,7 @@ pgwin32_doRunAsService(void)
 
 /*
  * Mingw headers are incomplete, and so are the libraries. So we have to load
- * a whole lot of API functions dynamically. Since we have to do this anyway,
- * also load the couple of functions that *do* exist in mingw headers but not
- * on NT4. That way, we don't break on NT4.
+ * a whole lot of API functions dynamically.
  */
 typedef BOOL (WINAPI * __CreateRestrictedToken) (HANDLE, DWORD, DWORD, PSID_AND_ATTRIBUTES, DWORD, PLUID_AND_ATTRIBUTES, DWORD, PSID_AND_ATTRIBUTES, PHANDLE);
 typedef BOOL (WINAPI * __IsProcessInJob) (HANDLE, HANDLE, PBOOL);
@@ -1768,9 +1766,6 @@ InheritStdHandles(STARTUPINFO *si)
  *
  * Returns 0 on success, non-zero on failure, same as CreateProcess().
  *
- * On NT4, or any other system not containing the required functions, will
- * launch the process under the current token without doing any modifications.
- *
  * NOTE! Job object will only work when running as a service, because it's
  * automatically destroyed when pg_ctl exits.
  */
@@ -1815,14 +1810,10 @@ CreateRestrictedProcess(char *cmd, PROCESS_INFORMATION *processInfo, bool as_ser
 
 	if (_CreateRestrictedToken == NULL)
 	{
-		/*
-		 * NT4 doesn't have CreateRestrictedToken, so just call ordinary
-		 * CreateProcess
-		 */
-		write_stderr(_("%s: WARNING: cannot create restricted tokens on this platform\n"), progname);
-		if (Advapi32Handle != NULL)
-			FreeLibrary(Advapi32Handle);
-		return CreateProcess(NULL, cmd, NULL, NULL, FALSE, 0, NULL, NULL, &si, processInfo);
+		/* Log error if we cannot get the function */
+		write_stderr(_("%s: could not locate object function to create restricted token: error code %lu\n"),
+					 progname, (unsigned long) GetLastError());
+		return 0;
 	}
 
 	/* Open the current token to use as a base for the restricted one */
diff --git a/src/interfaces/libpq/win32.c b/src/interfaces/libpq/win32.c
index e57b602476..447f64c072 100644
--- a/src/interfaces/libpq/win32.c
+++ b/src/interfaces/libpq/win32.c
@@ -271,10 +271,6 @@ struct MessageDLL
  * Returns a description of the socket error by first trying
  * to find it in the lookup table, and if that fails, tries
  * to load any of the winsock dlls to find that message.
- * The DLL thing works from Nt4 (spX ?) up, but some special
- * versions of winsock might have this as well (seen on Win98 SE
- * special install)			   / Magnus Naeslund (mag@fbab.net)
- *
  */
 
 const char *
diff --git a/src/port/dirmod.c b/src/port/dirmod.c
index 2818bfd2e9..ae6301dd6c 100644
--- a/src/port/dirmod.c
+++ b/src/port/dirmod.c
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *	This includes replacement versions of functions that work on
- *	Win32 (NT4 and newer).
+ *	Windows.
  *
  * IDENTIFICATION
  *	  src/port/dirmod.c