Video tutorial:
http://www.youtube.com/watch?v=0RANVWDOHxQ

Mikrotik 2011UAS-2HnD RouterOS 6.4 L5 as PPTP server
Windows 7 PL 32bit as client

Mikrotik... PPTP server... Windows client

1. Mikrotik
- internal LAN: 192.168.0.0/24, IP: 192.168.0.1
- external IP - XXX.XXX.86.23

Windows PC
- external IP: 193.106.192.1
- LAN 10.0.101.0/24, TpLink TL-WR740N - external IP
- LAN 192.168.1.0/24, TpLink TL-WR740N - internal LAN IP: 192.168.1.0/24
- Windows PC internal LAN IP pool 192.168.1.0/24

config I - secure
- Windows client PC all internet traffic going through PPTP VPN gateway
- Mikrotik PPTP pool 192.168.0.100 - 192.168.0.150
- Windows PC IP ...PPTP pool
- if client disable traffic rediret then looses PPTP pool acces and Mikrotik internal LAN acces

config II - unsecure
- client decides where goes internet traffic
- Mikrotik PPTP pool 192.168.2.1 - 192.168.2.200
- Windows PC IP ...Mikrotik local LAN pool
- client could change where goes internet traffic