I was noticing some weird things happening recently:
1) my friend's msn account keeps getting logged on without his permission and sending stuff to me and other friends
2) it says that i have logged on on a different computer on my msn account. I changed the password
3) Windows says that msnmsgr or something is corrupt and unreadable. ( not exact words but you get the flow)
4) a blogging website has been altered after the corrupt thing popped up. The links and icons are all messed up. The links are all in standard font and placed in a really odd manner.
5) MAINLY, my videos don't work. It doesn't even load. It is a blank screen. It is the same for every video site that i try. (youtube,metacafe,hulu, etc)

The msn log on & sending stuff to others sound like it might be malware. You need to take that question to the malware section for help on that. As for the videos, try updating to the newest version of adobe flash reader. Also we need more information? What OS? what browser(s)?