diff --git a/source/lib/sysdep/arch/x86_x64/apic.cpp b/source/lib/sysdep/arch/x86_x64/apic.cpp
index b05e0c33b7..7989db316b 100644
--- a/source/lib/sysdep/arch/x86_x64/apic.cpp
+++ b/source/lib/sysdep/arch/x86_x64/apic.cpp
@@ -52,7 +52,9 @@ static Status GetAndValidateApicIds()
 	const size_t numUnique = end-sortedApicIds;
 
 	// all IDs are zero - system lacks an xAPIC.
-	if(numUnique == 1 && sortedApicIds[0] == 0)
+	// (NB: we exclude single-processor systems in this test -
+	// having one zero-valued ID is legitimate)
+	if(numUnique == 1 && sortedApicIds[0] == 0 && numIds != 1)
 	{
 		debug_printf(L"APIC: all zero\n");
 		return ERR::CPU_FEATURE_MISSING;	// NOWARN
diff --git a/source/lib/sysdep/os/win/wvm.cpp b/source/lib/sysdep/os/win/wvm.cpp
index 9c5bcb2ed9..a6de15900b 100644
--- a/source/lib/sysdep/os/win/wvm.cpp
+++ b/source/lib/sysdep/os/win/wvm.cpp
@@ -287,6 +287,7 @@ CACHE_ALIGNED(struct AddressRangeDescriptor)	// POD
 		base = (intptr_t)AllocateLargeOrSmallPages(0, totalSize, MEM_RESERVE);
 		if(!base)
 		{
+			debug_printf(L"AllocateLargeOrSmallPages of %lld failed\n", (u64)totalSize);
 			DEBUG_DISPLAY_ERROR(ErrorString());
 			return ERR::NO_MEM;	// NOWARN (error string is more helpful)
 		}
@@ -344,7 +345,7 @@ CACHE_ALIGNED(struct AddressRangeDescriptor)	// POD
 	static const wchar_t* ErrorString()
 	{
 #if ARCH_IA32
-		return L"Out of address space (64-bit OS is required)";
+		return L"Out of address space (64-bit OS may help)";
 #elif OS_WIN
 		// because early AMD64 lacked CMPXCHG16B, the Windows lock-free slist
 		// must squeeze the address, ABA tag and list length (a questionable