C++ :: Creating And Terminating Threads?

I had a requirement where i needed to create a thread and if the execution of thread is not completed in 5 minutes i needed to terminate its execution and continue with other part of the code.

I used the below code to create the thread

_beginthread(FuncnCall,0,NULL);

HANDLE hThread = GetCurrentThread();

Then after this code, I used the below code to check for 5 minutes

for (int i=1;i<=0;i++) {
printf("Value of i=%d
",i);
if(threadFinished) {
break;
} else {
Sleep(1000);
}
}

After this if the value of "threadFinished" is false then i am terminating the thread like below

if(threadFinished == false) {
TerminateThread(hThread,0);
CloseHandle(hThread);
}

The Problem here is, after terminating the thread, the program abruptly closes by giving fatal error. Looks like memory leakage is happening after terminating the thread. Is it not the right way to safely exit the thread?