diff --git a/bochs/cpu/cpudb/atom_n270.cc b/bochs/cpu/cpudb/atom_n270.cc
index c97627581..3916c2cac 100644
--- a/bochs/cpu/cpudb/atom_n270.cc
+++ b/bochs/cpu/cpudb/atom_n270.cc
@@ -417,10 +417,16 @@ void atom_n270_t::get_std_cpuid_leaf_6(cpuid_function_t *leaf) const
 void atom_n270_t::get_std_cpuid_leaf_A(cpuid_function_t *leaf) const
 {
   // CPUID function 0x0000000A - Architectural Performance Monitoring Leaf
+/*
   leaf->eax = 0x07280203;
   leaf->ebx = 0x00000000;
   leaf->ecx = 0x00000000;
   leaf->edx = 0x00002501;
+*/
+  leaf->eax = 0; // reporting true capabilities breaks Win7 x64 installation
+  leaf->ebx = 0;
+  leaf->ecx = 0;
+  leaf->edx = 0;
 
   BX_INFO(("WARNING: Architectural Performance Monitoring is not implemented"));
 }
diff --git a/bochs/cpu/cpudb/core2_penryn_t9600.cc b/bochs/cpu/cpudb/core2_penryn_t9600.cc
index 09abf1ca1..13e14d6d0 100644
--- a/bochs/cpu/cpudb/core2_penryn_t9600.cc
+++ b/bochs/cpu/cpudb/core2_penryn_t9600.cc
@@ -468,10 +468,16 @@ void core2_penryn_t9600_t::get_std_cpuid_leaf_6(cpuid_function_t *leaf) const
 void core2_penryn_t9600_t::get_std_cpuid_leaf_A(cpuid_function_t *leaf) const
 {
   // CPUID function 0x0000000A - Architectural Performance Monitoring Leaf
+/*
   leaf->eax = 0x07280202;
   leaf->ebx = 0x00000000;
   leaf->ecx = 0x00000000;
   leaf->edx = 0x00000503;
+*/
+  leaf->eax = 0; // reporting true capabilities breaks Win7 x64 installation
+  leaf->ebx = 0;
+  leaf->ecx = 0;
+  leaf->edx = 0;
 
   BX_INFO(("WARNING: Architectural Performance Monitoring is not implemented"));
 }
diff --git a/bochs/cpu/cpudb/core_duo_t2400_yonah.cc b/bochs/cpu/cpudb/core_duo_t2400_yonah.cc
index 6f6e6dd65..d0707114a 100644
--- a/bochs/cpu/cpudb/core_duo_t2400_yonah.cc
+++ b/bochs/cpu/cpudb/core_duo_t2400_yonah.cc
@@ -417,10 +417,16 @@ void core_duo_t2400_yonah_t::get_std_cpuid_leaf_6(cpuid_function_t *leaf) const
 void core_duo_t2400_yonah_t::get_std_cpuid_leaf_A(cpuid_function_t *leaf) const
 {
   // CPUID function 0x0000000A - Architectural Performance Monitoring Leaf
+/*
   leaf->eax = 0x07280201;
   leaf->ebx = 0x00000000;
   leaf->ecx = 0x00000000;
   leaf->edx = 0x00000000;
+*/
+  leaf->eax = 0; // reporting true capabilities breaks Win7 x64 installation
+  leaf->ebx = 0;
+  leaf->ecx = 0;
+  leaf->edx = 0;
 
   BX_INFO(("WARNING: Architectural Performance Monitoring is not implemented"));
 }
diff --git a/bochs/cpu/cpudb/corei5_arrandale_m520.cc b/bochs/cpu/cpudb/corei5_arrandale_m520.cc
index 82e2518f9..4f60cca02 100644
--- a/bochs/cpu/cpudb/corei5_arrandale_m520.cc
+++ b/bochs/cpu/cpudb/corei5_arrandale_m520.cc
@@ -492,10 +492,16 @@ void corei5_arrandale_m520_t::get_std_cpuid_leaf_6(cpuid_function_t *leaf) const
 void corei5_arrandale_m520_t::get_std_cpuid_leaf_A(cpuid_function_t *leaf) const
 {
   // CPUID function 0x0000000A - Architectural Performance Monitoring Leaf
+/*
   leaf->eax = 0x07300403;
   leaf->ebx = 0x00000004;
   leaf->ecx = 0x00000000;
   leaf->edx = 0x00000603;
+*/
+  leaf->eax = 0; // reporting true capabilities breaks Win7 x64 installation
+  leaf->ebx = 0;
+  leaf->ecx = 0;
+  leaf->edx = 0;
 
   BX_INFO(("WARNING: Architectural Performance Monitoring is not implemented"));
 }
diff --git a/bochs/cpu/cpudb/corei5_lynnfield_750.cc b/bochs/cpu/cpudb/corei5_lynnfield_750.cc
index e9b197c26..0632520e5 100644
--- a/bochs/cpu/cpudb/corei5_lynnfield_750.cc
+++ b/bochs/cpu/cpudb/corei5_lynnfield_750.cc
@@ -468,10 +468,16 @@ void corei5_lynnfield_750_t::get_std_cpuid_leaf_6(cpuid_function_t *leaf) const
 void corei5_lynnfield_750_t::get_std_cpuid_leaf_A(cpuid_function_t *leaf) const
 {
   // CPUID function 0x0000000A - Architectural Performance Monitoring Leaf
+/*
   leaf->eax = 0x07300403;
   leaf->ebx = 0x00000044;
   leaf->ecx = 0x00000000;
   leaf->edx = 0x00000603;
+*/
+  leaf->eax = 0; // reporting true capabilities breaks Win7 x64 installation
+  leaf->ebx = 0;
+  leaf->ecx = 0;
+  leaf->edx = 0;
 
   BX_INFO(("WARNING: Architectural Performance Monitoring is not implemented"));
 }
diff --git a/bochs/cpu/cpudb/corei7_ivy_bridge_3770K.cc b/bochs/cpu/cpudb/corei7_ivy_bridge_3770K.cc
index 666e91d52..6c79725c0 100644
--- a/bochs/cpu/cpudb/corei7_ivy_bridge_3770K.cc
+++ b/bochs/cpu/cpudb/corei7_ivy_bridge_3770K.cc
@@ -555,10 +555,16 @@ void corei7_ivy_bridge_3770k_t::get_std_cpuid_leaf_7(Bit32u subfunction, cpuid_f
 void corei7_ivy_bridge_3770k_t::get_std_cpuid_leaf_A(cpuid_function_t *leaf) const
 {
   // CPUID function 0x0000000A - Architectural Performance Monitoring Leaf
+/*
   leaf->eax = 0x07300403;
   leaf->ebx = 0x00000000;
   leaf->ecx = 0x00000000;
   leaf->edx = 0x00000603;
+*/
+  leaf->eax = 0; // reporting true capabilities breaks Win7 x64 installation
+  leaf->ebx = 0;
+  leaf->ecx = 0;
+  leaf->edx = 0;
 
   BX_INFO(("WARNING: Architectural Performance Monitoring is not implemented"));
 }
diff --git a/bochs/cpu/cpudb/corei7_sandy_bridge_2600K.cc b/bochs/cpu/cpudb/corei7_sandy_bridge_2600K.cc
index 0ca7a7ce7..325854d33 100644
--- a/bochs/cpu/cpudb/corei7_sandy_bridge_2600K.cc
+++ b/bochs/cpu/cpudb/corei7_sandy_bridge_2600K.cc
@@ -514,10 +514,16 @@ void corei7_sandy_bridge_2600k_t::get_std_cpuid_leaf_6(cpuid_function_t *leaf) c
 void corei7_sandy_bridge_2600k_t::get_std_cpuid_leaf_A(cpuid_function_t *leaf) const
 {
   // CPUID function 0x0000000A - Architectural Performance Monitoring Leaf
+/*
   leaf->eax = 0x07300803;
   leaf->ebx = 0x00000000;
   leaf->ecx = 0x00000000;
   leaf->edx = 0x00000603;
+*/
+  leaf->eax = 0; // reporting true capabilities breaks Win7 x64 installation
+  leaf->ebx = 0;
+  leaf->ecx = 0;
+  leaf->edx = 0;
 
   BX_INFO(("WARNING: Architectural Performance Monitoring is not implemented"));
 }