How to run a .exe file through wxpython script ?

Hello All,
I have written a small script which should actually take any exe file
and i am using os module to get the path of the exe and it should be
executed the number of times which user will input. But its working when i
am giving complete path hardcoded. But when i use open dialog to get the
file and i am joining the path. I am printing the path taken by the open
dialog and it shows correctly but when i am using os.system() function to
open that exe it doesn't recognize the path and it takes on C:\dirname
which is directory name ofr example C:\python24 but it misses the
python.exe part. Can you have a look in the code and tell me where i am
missing something.

import wx
import os

class ScrolledWindow(wx.Frame):
def __init__(self, parent, id, title):
wx.Frameinit__(self, parent, id, title, size=(450, 300))
panel = wx.Panel(self, -1)
self.txt1 = wx.TextCtrl(panel, -1, pos=(30, 50), size=(150, 20))
self.button11 = wx.Button(panel, -1, "", pos=(200,50))
self.button11.Bind(wx.EVT_BUTTN, )

self.text1 = wx.StaticText(panel, -1, "Number of times you want the
simulation to run", (150, 20))
self.txt2 = wx.TextCtrl(panel, -1, pos=(30, 150), size=(50, 20))
self.button12 = wx.Button(panel, -1, "Run", pos=(200,150))
self.button12.Bind(wx.EVT_BUTTN, Run)
#txt1.write(name)

self.Centre()
self.Show()
def Run(self,event):
count = int(self.txt2.GetValue())
val = 0
while(val<count):
os.system(self.name)
print "hello"
val +=1

def (self,event):
self.dirname = ''
dlg = wx.FileDialog(self, "Choose a file", self.dirname,"",
"*.exe*", PEN)
if dlg.ShowModal()==wx.IDK:
self.filename=dlg.GetFilename()
self.dirname=dlg.GetDirectory()
self.name = os.path.join(self.dirname,self.filename)
self.txt1.write(self.name)
print self.name

dlg.Destroy()


app = wx.App()
ScrolledWindow(None, -1, 'Run the simulation')
app.MainLoop()

- Varsha