Thread: delete a node from linked list problem

Code:

arxeio=first;         s=0;
         while(arxeio!=NULL)
         {
            if (arxeio->aStudent->idNumber==iddel)
            {
            printf("erasing id %d",arxeio->aStudent->idNumber);
    if(first->aStudent->idNumber==iddel)     /* first node to be deleted) */
    {
        temp1 = first->next;  
        free(first);        
        first= temp1; 
        s=1;    
    }


              }
              
                   
           if (arxeio->next->aStudent->idNumber==iddel)
            {
            if (arxeio->next!=NULL)   
            {
              temp1=arxeio->next->next;
              free(arxeio->next);
              arxeio->next=temp1;
              }                                              
            s=1;
            }


            arxeio=arxeio->next;
            } 
            if (s!=1)
            { 
                     printf("error! wrong id");
            }

the list contains the following nodes
first:
alex
4598
------
john
2245
------
tom
4445

if i ask to delete the id 4445 my program works just fine,if i ask to delete any other node the program stops.any idea why is this happening?