Can I remove some posts?

I just want to filter a few posts out from Top Posts widget. Actually, a plugin on my wordpress blog messed up feeds and now, PostRank shows some posts twice (the only difference is on urls, one is the original one while other one is messed up by plugin like this: http://my-blog.com/post/?utm=asdasff and so on!) So, is it possible to filter some posts(there are 12 of them)