Chinese bot visiting non-existent page every 5 minutes

Chinese bot visiting non-existent page every 5 minutes

Since 02.05.2013 some sort of bot is visiting my website, every 5 minutes.
Most of the time it calls this URL, which doesn't exist:
/viewtopic.php?f=3&t=849
Always with this user agent
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; TencentTraveler ;
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR
2.0.50727)
(= IE 6, Windows XP)
Not only it distorts the visitors statistic significantly, it doesn't even
identify as a bot, so I guess it is a spammer of some sort. My question
here is, what does this client do and why is it calling this page
continuously? - And how can I prevent this?
I'm using a vServer with Linux Debian.