Why do my hacks work for XP only?

#include<windows.h>

#define grenades ((i==6)||(i==7)||(i==8)||(i==64)||(i==100)||(i==12 6)||(i==135)||(i==209)||(i==210)||(i==240)||(i==26 3)||(i==272)||(i==338)||(i==382)||(i==383)||(i==38 4))
//#define Knifes ((i==5)||(i==35)||(i==74)||(i==132)||(i==239)||(i= =372)||(i==381))
//#define Mutant ((i==120)||(i==176)||(i==177)||(i==178)||(i==182)| |(i==195)||(i==196)||(i==197)||(i==198)||(i==199)| |(i==223)||(i==224)||(i==225)||(i==226)||(i==227)| |(i==228)||(i==270)||(i==271)||(i==302)||(i==303)| |(i==304)||(i==305)||(i==306)||(i==307))

//addies 01/05/2011
#define WeaponMgr 0xA0F338
#define NoReload 0x2420
#define WeaponDamage 0x07F8

float Hithard = 999.0f;
float FragDmg = 0.0f;

//prevent noob leecher from hex editing
char Msg[] = {'w','w','w','.','m','p','g','h','.','n','e','t',' w','o','r','k',0 };
char Title[] = {'N','A',' ','C','F',' ','H','A','C','K',0 };

DWORD WINAPI Hacks(LPVOID)
{
//in case u need it, dont forget use "else"
bool onehit = 1,
reload = 1,
fragdmg = 1;

while(1)
{
DWORD CShell = (DWORD)GetModuleHandleA("CShell.dll");
DWORD pWeaponMgr = *(DWORD*)(CShell + WeaponMgr);

//hotkeys toggle + beep sounds
if(GetAsyncKeyState(VK_F9) || GetAsyncKeyState(VK_NUMPAD0) &1) { onehit = true; Beep(512, 100); }
if(GetAsyncKeyState(VK_F10) || GetAsyncKeyState(VK_NUMPAD1) &1) { reload = true; Beep(512, 100); }
if(GetAsyncKeyState(VK_F11) || GetAsyncKeyState(VK_NUMPAD2) &1) { fragdmg = true; Beep(512, 100); }

//one hit kill
iffor(onehit)
{
if (pWeaponMgr)
{
for(int i=0; i<445; i++)
{
if((*(DWORD*)((*(DWORD*)(CShell+WeaponMgr))+(4*i)) ) != NULL)
*(float*)((*(DWORD*)((*(DWORD*)(CShell+WeaponMgr)) +(4*i))) + WeaponDamage) = Hithard;
}
}
}

//no reload
if(reload)
{
if (pWeaponMgr)
{
for(int i=0; i<445; i++)
{
if((*(DWORD*)((*(DWORD*)(CShell+WeaponMgr))+(4*i)) ) != NULL)
*(float*)((*(DWORD*)((*(DWORD*)(CShell+WeaponMgr)) +(4*i))) + NoReload) = 100;
}
}
}

//no grenade damage
if(fragdmg)
{
if (pWeaponMgr)
{
for(int i=0; i<445; i++)
{
if((*(DWORD*)((*(DWORD*)(CShell+WeaponMgr))+(4*i)) ) != NULL && (grenades))
*(float*)((*(DWORD*)((*(DWORD*)(CShell+WeaponMgr)) +(4*i))) + WeaponDamage) = FragDmg;
}
}
}
Sleep(100);
}
}

bool Ready2Hook
{
if(GetModuleHandleA("CShell.dll") != NULL
&& GetModuleHandleA("ClientFx.fxd") != NULL)
return 1;
return 0;
}

DWORD WINAPI Wait(LPVOID)
{
while(!Ready2Hook()) Sleep(200);
CreateThread(NULL, NULL, (LPTHREAD_START_ROUTINE)Hacks, NULL, NULL, NULL);
return 0;
}

BOOL WINAPI DllMain ( HMODULE hDll, DWORD dwReason, LPVOID lpReserved )
{
DisableThreadLibraryCalls(hDll);

if ( dwReason == DLL_PROCESS_ATTACH )
{
//optional
MessageBoxA(0, Msg,Title, 0);
system("start www.mpgh.net");

CreateThread(0,0,(LPTHREAD_START_ROUTINE)Wait,0,0, 0);
}
return 0;
}