Just been browsing on wikipedia and a message from norton flashed up saying analyzing 7rwzxvzu.exe.part. Then said it was a threat and removed. I didn't try and download anything, anyway i was on wikipedia.
Insight said the threat was ws.reputation.1 and that the file was released a week ago and fewer than 5 users in the norton community have used this file. I can't think where it could have come from in the first place. Seemed to be in appdata\local\temp