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OK OP I've done some sleuthing.
The poster you're looking for is mentioned (in text only) in a book called The International Business Environment by Brooks, Wilkinson and Weatherston. The bit you're interested in reads:
"Virgin Interactive Entertainment (Europe) Ltd produced a poster for a Sony computer game 'Resident Evil', showing a bath full of blood. The ASA decided that the advertisement should only be allowed in adult magazines." (p294)
Unfortunately, they don't give a citation for the ASA ruling, and the ASA themselves only keep 5 years of archives on their website (and charge money for any further digging). However, the Internet Wayback Machine has archives of the ASA's website throughout the years, and, after more sleuthing, I found the ruling at https://web.archive.org/web/19971017075622/http://www.asa.org.uk/adj/adj_1051.htm
The downside to the ruling is that Virgin apparently said that this particular campaign was already over, so the possibility of finding it in back issues of adult magazines like Loaded or Maxim sounds slim, but it's still one avenue for you.
I'm also presuming the forum you found is
The OP there, twmac, posted a photo of the poster from an MCV article on shock advertising. The photo is displayed as 'not found', and I couldn't find any archived version, but maybe there is one out there somewhere, if you can find a filename (which might be a string of numbers untagged to anything RE related, which would also explain why it doesn't come up on a google search). MCV's online archives
only go back to 2007, but the article on shock advertising must have been from before July 2005 (twmac's OP date). Getting print back issues is another possibility though, maybe.
twmac's signature mentions that he writes for arcadianrhythms.com, which seems to now be defunct. However, their Twitter, whilst a bot, is still active and links to three other handles, @shanucore @badgercommander and @sw0llengoat.
You could try tweeting them to see if they are or if they know twmac, and see if he at least still has the photo or magazine he got the photo from?
Or, you could try contacting Virgin directly and ask if they have an archived copy of it (I'd be very surprised if they destroyed all copies of it). You never know, if you're complimentary enough about some of their current services, the PR team might send you out a large print (according to the idlethumbs thread, someone there once had a 30 foot tall version). Companies love feedback and do give out small rewards on occasion.
Good luck with the search!