Python Experimental Anti-Virus

__author__ = 'Zakkq'
# Firestorm - Fight fire with fire

import binascii
import sys
import os
import time
if sys.version_info < (3,0):
    import Tkinter as tkinter
    import tkMessageBox as mbox
else:
    import tkinter
    import tkinter.messagebox as mbox
mfs = raw_input('Max file size you want to scan? in Mega Bytes eg "5": ')
sd = raw_input('Starting Directory, Standard is "C:\\": ')
c = 0
string = []
# Getting the HEX Signatues
with open("signatures.txt", 'rb') as s:
    content = s.read()
# Formatting the HEX Signatues
contentbuffer = content.rstrip().split('\n')
i = 0
while i < len(contentbuffer):
    string.append(contentbuffer[i].split('=', 1)[1])
    i = i + 1
# Setting starting Dir
if sd == "":
    directories = ["C:\\"]
else:
    directories =[sd]
# Choosing files not to scan
safeFiles = ["signatures.txt"]
while True:
    if len(directories) == 0:
        window = tkinter.Tk()
        window.wm_withdraw()
        mbox.showinfo('Virus Detector','DONE ' + str(c) + " Scanned Objects -" + " " + str(filename))
        break
    folder = directories[0]
    del directories[0]
    print folder
    try:
        filename = os.listdir(folder)
    except Exception as e:
        print "Error reading dir:", folder
        continue
    i = 0
    filename2 = []
    if len(directories) > 1000 or len(filename) > 10000:
        print "Breaking because of too much stuff"
        break
    for cur_file in filename:
        abs_path = os.path.join(folder, cur_file)
        if os.path.isfile(abs_path):
            #print "FILE:", cur_file
            filename2.append(abs_path)
        elif os.path.isdir(abs_path):
            #print "DIR:", cur_file
            directories.append(abs_path)
        else:
            print "IGNORING:", cur_file
    filename = filename2
    i = 0
    while i < len(string):
        string[i] = " ".join(string[i][g:g+2] for g in range(0, len(string[i]), 2))
        string[i]=string[i].replace(" ",",")
        i = i + 1
    i = 0
    print str(filename) + "\n"
    try:
        for cur_file in filename:
            t0 = time.clock()
            base_name = os.path.basename(cur_file)
            #print base_name
            if os.path.getsize(cur_file) > (mfs * 1024 * 1024):
                print "Large file ignored", cur_file
                continue
            try:
                if cur_file in safeFiles:
                    print "file in SafeFiles ignored:"
                    continue
                else:
                    with open(cur_file, 'rb') as f:
                        content = f.read()
                        c = c + 1
            except IOError as err:
                print "Unable to read:", cur_file
                continue
            hex = str(binascii.hexlify(content))
            formatted_hex = ','.join(hex[i:i+2] for i in range(0, len(hex), 2))
            i = 0
            while i < len(string):
                if string[i] in formatted_hex:
                    window = tkinter.Tk()
                    window.wm_withdraw()
                    mbox.showinfo('Virus Detector','VIRUS AT ' +  cur_file + " The virus signature number is " + string[i])
                else:
                    i = i + 1
                    pass
            a = time.clock() - t0
            astring = str(a)
            print base_name + " Has been Scanned it took: " + astring[:3] + " :seconds to scan the element"
    except Exception as e:
        exc_type, exc_obj, exc_tb = sys.exc_info()
        fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
        print(exc_type, fname, exc_tb.tb_lineno)
        print time.clock() - t0
        raw_input()