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 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.