Do you have SSH set up?
If so then that's all you need from the Pi side of things.
On the machine that you want to use a web browser on while proxying traffic through your Pi, install Putty.
Expand Connection > SSH > Tunnels
Click the "Dynamic" Radio button
Enter a port into "Source port", I use 1234
You will now see "D1234" under forwarded ports
Now use SSH as normal to connect to your Pi from a remote connection (save the setup to save having to set this config each time)
Now open your web browser and go to your network settings, I use Firefox.
Under SOCKS Host, type in the IP of 127.0.0.1 and the port of 1234 (or whatever you chose above).
Traffic in Firefox will now go via an encrypted SSH session to your Pi and then onwards to the internet.
I think this is what you were after, sorry if it wasn't but it may still prove to be useful for someone else