Sounds to me like you kinda got a good start, then went the wrong direction. If I understand correctly, you have the same model router on both sides. If that is correct, I would try to establish the VPN router to router instead of Windows client to router. The directions you refer to above are for the latter (Windows to router).
Having said that, and assuming that is what you want to do, you will need to get rid of the VPN connection on your computer and reset your router to factory defaults so you can get to the setup. On the computer that you started to setup the VPN, Click Start --> Settings --> Dialup and Network Connections --> Right click on the VPN connection and select Delete. On the router, use a paperclip or similar to press the reset button on the router, hold for 3 seconds or until the red 'Diag' light comes on. Restart your computer and try to log into the router admin again. Change any settings that you changed earlier to get the internet connection working (if any).
Next, you will need to change the addresses of your routers on both sides. I posted a rather lengthy explaination in thread463-447092 on Jan 15, but if you want the short version, log into the router. On the setup tab, change the router's ip address (the one labeled device ip) to 192.168.2.1 . Click apply and restart your computer. You will need to do the same on the other router, but use 192.168.3.1 on that one. (Doesn't matter which one gets which address, point is they need to be different.)
Now, you should still be able to browse the internet, and you should be ready to setup a VPN connection. Log into the router again. You will need to use the ip address that you just assigned in the last step instead of the default provided by Linksys.
Click on the VPN tab. Mark the 'Enable' box and type a name for the connection in the 'Tunnel Name' box, can be anything you want and does not have to be the same on the other end. In the 'Local Secure Group' section, select 'Subnet' from the drop down box, type the address you entered for the 'Device ip address' on this router earlier, replacing the last 1 with a 0, ie 192.168.2.0. In the 'Remote secure group' select 'Subnet' and type the 'Device ip address' of the other router, again replacing the last 1 with a 0.
Select 'Any' from the drop down box labeled 'Remote secure gateway'. Select 'Disable' for Encryption and Authentication. You will want to change both of those after you get this working, but for now turn them off to simplify things. Click apply to save the settings.
Next click on the 'Status' tab. Write down the 'WAN ip address', you will need it for the other router.
Complete the same steps for the other router. Be sure to flip the local and remote secure ip addresses. This time, select 'IP Addr' from the drop down box labeled 'Remote secure gateway'. Type the 'WAN IP address of the other router in the box to the right. Click apply.
You should be able to try a connection. On the first router, the one set for 'Any' secure gateway, click connect. Then on the other router, also click connect. Should fire right up (if my instructions are clear enough).
Few things to keep in mind if you do connect . . . You will want to change the security settings once you get the basics worked out. As configured, anyone can connect to your router. Also, you probably don't have fixed ip addresses, so your ISP can change them whenever they wish. You will need to check your address each time you connect.
Hope this is of some help. Report back any problems, try to be as specific as you can.