PPTP default gateway Problem

Hello,
i create pptp connection on win8 client , after connectin , default gateway=0.0.0.0 , in this status every thing is OK , but in win xp ,after connection, defaultgateway gets equal to ipaddress and nothing works.

any suggestion

Default gateway=0.0.0.0?

Do you mean you have a default route 0.0.0.0/0 pointing at something?

If you still need to point it at something:

/ip route add dst-address=0.0.0.0/0 gateway=<GW IP address>

or

/ip route add dst-address=0.0.0.0/0 gateway=<GW interface>