I was wrong, Vista will auto RWIN from what I understand but not MTU
At the last link I gave you to ECN
There is a link to change MTU
As mentioned, I would think
14921496 would be a better setting for dsl
cable likes 1500
You could try the change in the other computer, create restore point ahead of time
Also look at Router configuration to see what it's set at
Up to you Pureblood

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EDIT>>Forgot to add, I would enable protections for Windows Defender
Not sure if I would also use realtime protections with Spyware Terminator
2 protections doing the same thing
If you keep Spyware Terminator, you can utilize the Immunization feature