Tech Support with Microsoft

Folks,

It appears that my security was breached while I was in my yahoo and linking into Facebook Blogstreamers's Reunited page.  I don't know why or what, and even though Microsoft Security Essentials have been in my computer and fixed this issue, I am gun shy about coming back into Facebook.  If I do, its definitely no games and no download for games.

Question:  Is anyone else having issues with either email or their links associated to Facebook out of their email?  It raises concerns for me about that site.  Now that I think about it, Isabella and I downloaded a Bejewled game.  We clicked a link in Facebook which took us to another page to download (?I want to say pickle something?)...anyway, the next day my homepage was different, and my browser seemed hijacked on search, things were just weird; I thought I had fixed it, nothing came up on scan until this latest.  It could have been related, not sure. 

Anyway, holler back if you have experienced browser instability, hanging up, yahoo mail or facebook issues.  I am curious to know.