Hi,
There are a multitude of websites that will build crappy links going back to your website. Many of these links probably aren't a problem as I would bet Google knows the sites and their M.O. Yes, anyone can link to you and most of the time I wouldn't worry about these things. Bing does have a way for you to inform them of links you disavow. Check out the article here : http://searchengineland.com/bing-launches-way-to-disavow-links-but-why-126262
The easiest way to remove links is not very easy at all and involves contacting the site owners. I'm not aware of any specific tool Google has but I understood they were working on a similar tool to allow you to disavow links. A recent SEOMoz article did cover the procedure for dealing with negative SEO pretty well: http://www.seomoz.org/blog/to-catch-a-spammer-uncovering-negative-seo
There will always be a difference between OSE and Google reports of links. Totally normal.
