Access Violation in Dynamic CWinThread Array

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C

MFC

For dynamic thread array in my MFC application

CWinThread **Thread;
UINT ParentTh()
{
......
int block;
cnt=0;

Thread[cnt]=(CWinThread *)malloc(sizeof(CWinThread));//gives access vilation
.....
while(block>0)
{
Thread[cnt]=AfxBeginThread(Child1...)
cnt++;
Thraed[cnt]=AfxBeginThread(child2...)
cnt++;
}
....
Plz help...
for unbounded thread allocation
Thread[cnt]=(CWinThread*)malloc(sizeof(CWinThread));//dy memory for 1 thread
and gradually the cnt increases upto block*2