Hi Forget,
It may not delete it because it is "running".
Try the following
Press <CTRL> <ALT> <DELETE>
Under the applications tab can you see "reeboot.exe".
If you can then highlight it and click "end task"
It may be running under the next tab "Processes". Again, if it is highlight it and click "end Process"
Now re -run your AV software and see if it will delete it (or quarantine it). If it won't you may have to locate the file yourself and delete it.
What message were you getting from Norton?
Hope this helps,
F - Wyg