L'enumerazione dei processi,all'appaenza può sembrare complicata ma non lo é.
Un esempio che usa le api:
Create una list box e un command;

Nel generale del form mettete questo

Private Const TH32CS_SNAPPROCESS = &H2 
Private Const MAX_PATH As Integer = 260 
Private Type PROCESSENTRY32 
    dwSize As Long 
    cntUsage As Long 
    th32ProcessID As Long 
    th32DefaultHeapID As Long 
    th32ModuleID As Long 
    cntThreads As Long 
    th32ParentProcessID As Long 
    pcPriClassBase As Long 
    dwFlags As Long 
    szExeFile As String * MAX_PATH 
End Type 

Private Declare Function CreateToolhelp32Snapshot Lib "Kernel32" (ByVal lFlags As Long, ByVal lProcessID As Long) As Long 
Private Declare Function Process32First Lib "Kernel32" (ByVal hSnapShot As Long, uProcess As PROCESSENTRY32) As Long 
Private Declare Function Process32Next Lib "Kernel32" (ByVal hSnapShot As Long, uProcess As PROCESSENTRY32) As Long 
Private Declare Sub CloseHandle Lib "Kernel32" (ByVal hObject 

Nel pulsante

Dim hSnapShot As Long 
Dim uProcess As PROCESSENTRY32 
Dim lngRet As Long 
hSnapShot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0&) 
uProcess.dwSize = Len(uProcess) 
lngRet = Process32First(hSnapShot, uProcess) 
List1.Clear 
Do While lngRet 
List1.AddItem Left$(uProcess.szExeFile, InStr(1, uProcess.szExeFile, vbNullChar) - 1) 
lngRet = Process32Next(hSnapShot, uProcess) 
Loop 
CloseHandle hSnapShot 

Tutto qui
P.S.Ogni volta che clikkerete sul pulsante la lista si aggiornerà