Cant set breakpoint using dbg.load()

[Vlad-tri]

module3.txt

from pydbg import *
from pydbg.defines import *
import pefile

dbg = pydbg()
dbg.load("c:\windows\system32\notepad.exe")
pe = pefile.PE("C:\Windows\System32\notepad.exe")
entrypoint = pe.OPTIONAL_HEADER.ImageBase + pe.OPTIONAL_HEADER.AddressOfEntryPoint
dbg.bp_set(entrypoint)
pydbg.debug_event_loop(dbg)