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The user profile in Windows is corrupted in some way. Unless you can pinpoint the exact moment that happened (and you really can't since you have to shut down messenger and restart to even know anything is amiss) it's really virtually impossible to know the exact cause of it.
Many people report removing malware/viruses and then having the problem, so it points to something purposely changing the user profile. However, it is possible a change in something like IE or even Yahoo potentially could do it. I've seen stranger things mess up a user profile.
Bottom line is that if believe your machine is free of malware, the easiest way to correct the problem is to create a new user profile on Windows. It's a lot easier than other possible solutions to the problem for sure.
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