The question is in the title, i want to make the Windows client compatible with the VPN of my RV042 because Shrew Soft VPN fail to etablish tunel after little time and QuickVPN don't support Windows 7 or any 64 bit version of Windows.
Shrew offers a Liux/BSD build, you can check it out here http://shrew.net/download/ike
Hope that helps.
Windows does not have an IPSec client, what they offer is a VPN client that can connect to PPTP, L2TP/IPsec (over IPSec), IKEv2. To connect directly to the RV router our only option is to connect via PPTP once the PPTP server is enabled on the router. If you have a server behind the router you can configure it to be an end point for any of the above types. Not sure why, Mac, and Windows do not offer a bare IPSec feature to their built-in clients.
Some third party applications to concider:
Windows: ShrewSoft IPSec client
Mac OS X: IPSecuritas
Both are relative simple to set up and on the RV0xx routers work fantastic and are an exellent alternative to QVPN. With these applications you would set up the tunnel as a group and use the "Microsoft XP/2000 VPN Client" option. This option is a little misleading as it seems to imply that the Native VPN client can support IPSec settings, when it is just referencing that a computer would use this option when its WAN IP address is not always known.
Hope this helps.