from www.tmz.com – Erin Andrews is back on the warpath over several images from her infamous (and illegally shot) nude peephole video — after she discovered a website that refused to pull the pics down.

More than one year after the video first surfaced, Erin claims she can still find the images on www.TheDirty.com — so she had her lawyer fire off a letter, demanding the site wipe them from cyberspace.

In the letter– obtained by TMZ — Erin’s lawyer claims The Dirty is “unlawfully” posting the pics because “the copyright of these images belongs exclusively to Ms. Andrews” — and posting them constitutes an invasion of her privacy.

Erin’s lawyer wants The Dirty to erase any trace the stills may leave behind — by 86’ing them “from all search engine databases, including, but not limited to, Google” … or else face a serious lawsuit.

So far, the people at The Dirty don’t seem to care — in fact, after receiving the letter … they reposted the pics at the top of their site.