Anyone know what browser (or maybe spider) this is?

Hits my site like crazy, might slow down server

[DrOliver]

Anyone know them?

• Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1
  
• Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1
  
• Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1
  

This is hammering my site like crazy and slowing down my server. Any idea what this could be? It does seem to be some kind of spider though, since there are literally thousand of hits in a very short time.

Can anyone help me stop this in robots.txt and .htaccess?

[Splosh]

There is a previous thread about this user agent here

[webmasterworld.com...]

Dont know if it will help much though