Mcafee v8
Had something similar happen when I activated the PRIVACY SERVICE that comes with Mcafee 8. The World as I'd known it suddenly changed, I had a split personality and two users (plus a requirement to satisfy numerous onboard protesting pop-ups (i.e. not web-based but installed programs that had suddenly had an identity failure or felt suddenly alienated or disenfranchised).
In fact McAfee 8 has so many inbuilt fiascoes that you can waste days trying to track down their unpublicised hotfixes and apply them. The inability to send email attachments from Outlook or OE has been going on now for over 8 months). Only Mandrake can locate the hotfix (and that is a debilitating workaround only).
The rest of the McAfee alienation story is too long to tell here. Check the Forums for unhappy punters.