Certain sites need refreshed to load or won't load at all

Hey guys,

Here's the challenge:-

Running Windows 7/XP wired by ethernet to a home router.

A lot of sites I'm visiting seem to instantly crash (website not found) and need refreshed a few times before loading up.

Sometimes they don't load from clicking a Google search, and no matter how many times I click refresh they don't work. But if I go to the address bar and hit enter, it loads!

And one or two sites that I visit just won't load at all.

What I've tried that did NOTHING:-

Fresh installing XP and 7.

Chrome, IE and Firefox.

New LAN drivers.

Flushing cache, renewing IP.

Installing a USB wifi stick.

Safe mode.

What DID WORK:-

My iPod on wifi loads them all perfectly.

If I boot up mini Linux, all sites work perfectly!

If I boot up mini XP, the sites work after refreshing a few times (even the ones that don't work at all during normal boot up).

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Hope that jumble makes sense!

Any ideas how to fix this?

Thanks a lot!