Do not clear and reset CR4 and the PSE enable bool on CPU config chan…

…ge. That explains the bug where changing the cycle count using the configuration GUI causes Windows XP to immediately crash, because the handler was resetting CR4 and the PSE state.

src/cpu/cpu.cpp

@@ -3616,9 +3616,16 @@ class CPU: public Module_base {
         mainMenu.alloc_item(DOSBoxMenu::item_type_id,"cputype_experimental").
             set_text("Experimental").set_callback_function(CpuType_ByName);
 
+        do_pse = false;
+        enable_pse = false;
+
 		CPU::Change_Config(configuration);	
 		CPU_JMP(false,0,0,0);					//Setup the first cpu core
         menu_update_dynamic();
+
+        if(CPU_ArchitectureType >= CPU_ARCHTYPE_486NEW) {
+            cpu.cr4 = 0;
+        }
 	}
 	bool Change_Config(Section* newconfig) override {
 		const Section_prop * section=static_cast<Section_prop *>(newconfig);
@@ -4134,13 +4141,10 @@ class CPU: public Module_base {
 
         if (enable_cmpxchg8b && CPU_ArchitectureType >= CPU_ARCHTYPE_PENTIUM) LOG_MSG("Pentium CMPXCHG8B emulation is enabled");
 
-	if (CPU_ArchitectureType >= CPU_ARCHTYPE_486NEW) {
-		do_pse = false;
-		cpu.cr4 = 0;
-	}
-	else {
-		enable_pse = false;
-	}
+        if (CPU_ArchitectureType < CPU_ARCHTYPE_486NEW) {
+            do_pse = false;
+            enable_pse = false;
+        }
 
 		menu_update_core();
 		menu_update_cputype();