Make a function call itself after set amount of time

[Bart Nessux]

How do I make a function call itself every 24 hours. Also, is there a 
way to start the program automatically w/o depending on the OS functions 
like 'Task Scheduler' or 'Start Up Items'... this is on Windows 2k and 
xp. Below is an example of what I'm trying to do.

TIA

def ipconfig_email():
    from email.MIMEText import MIMEText
    import smtplib
    import time
    import os

    u = "user name"		#Change This to user's name.
    f = "my-email-addy"
    t = "my-email-addy"

    fp0 = os.popen("ipconfig /all", "r")
    fp1 = os.popen("psinfo -d -s", "rb")
    msg = MIMEText(fp0.read() + fp1.read())
    fp0.close()
    fp1.close()

    msg["Subject"] = "%s's IPconfig Report" % u
    msg["From"] = f
    msg["To"] = t

    h = "my.smtp.server"
    s = smtplib.SMTP(h)
    s.sendmail(f, t, msg.as_string())
    s.quit()
    time.sleep(86400)	#24 hour sleep
    HOW_DO_I_CALL_THE_FUNCTION_AGAIN?

ipconfig_email()