Network issue with Windows 7 - characters keep appearing in putty session

I have searched for a solution to this problem on the inteet for months, to no avail.

Whenever I use putty to SSH to a server from one of my Windows 7 machines (64bit, PRO), I am constantly seeing control characters appear as if typed in by my computer. I am not touching the keyboard. It's so bad that it will cause the session on some unix hosts to drop spontaneously, and also causes havok if I try and edit programs on the server. Basically it's a nightmare.

I have other machines on this network including an ipad, a mac and another windows 7 machine (32 bit). On those machines inside the same local network, I can connect to the same servers and never get any mystery control characters on the input.

I know it's something in the network stack on this one machine - a DLL or some other bit of software that's sitting between me and the server that's adding all these characters, but I've disabled all the usual culprits to no avail. Wireshark will show the characters appear, but does not give any hints as to how or why or where.

I'm wondering if anyone has seen similar behaviour and knows which program or driver might be the cause.

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