Might be good to run this tool...

Microsoft has released a tool on Windows Update that will check your machine for the most recently discovered malicious software.

Make sure you have automatic updates turned on such that you don't need to proactively go and get this stuff, but if you want to be sure you've got it you can download the ActiveX control on the following page: http://www.microsoft.com/malwareremove

Remember, always be careful when downloading ActiveX controls and make sure that the publisher that created the control is one you trust. For instance... On this control you should see that the publisher is Microsoft Corporation. This information will be displayed on the ActiveX download prompt...