Hi,
Have a read of this Whiteboard Friday where Rand talks about this exact issue - Number 1...
_Number one: I'm worried because I have too many links pointing to my site from one particular domain. Maybe it's a site-wide link. Maybe they just embedded you in their blogroll, and it's linking to you. This isn't a problem unless the links are coming from a highly manipulative source, in which case you'd hope they weren't linking to you anyway. But I wouldn't stress too much about it. I'll get to people pointing bad links to you in a second. If you have 80,000 links pointing to you from one particular site, don't stress. This isn't going to kill your SEO. It's not the end of the world. If there's a good, editorial, natural reason why those links should exist, it's probably going to help you. What it won't do is help you 79,000 times more than if you just had a few pages on there, but it will help. It's not a terrible thing. Don't panic. I would almost never worry about this unless the links are from particularly terrible, spammy pages, in which case you might sort of worry, right? _
-Andy