Go Start>Run, type in:
regedit
Click OK.
Registry Editor will open.
Go File>Export, and save your registry to known location.
Now press F3 key.
Search window will open.
Type in:
Symantec
Click Find next
When Symantec entry is found, right click on it, click Delete
Keep pressing F3 key to find more Symantec entries. Delete them all.
Repeat same actions, this time searching for Norton