This is what I found Googling & is probably what you have tried.
I also found that is the magnifier is in a "Startup" in your "Programs" list it can cause this.
The recommendation is to remove the shortcut if it is there.
Also found this :
Click Start and "Run..." Type in "regedit". The following procedure will edit the Windows registry, a database of Windows settings, to remove magnifier from its copy of the startup queue. See the warning below before proceeding.
Open the "HKEY_LOCAL _MACHINE" folder.
Open the "SOFTWARE" folders, and then within that, "Microsoft" and "Windows".
Click on the "Run" folder, and look at the list of values, called keys, on the right side of the screen. You are looking for a key that mentions the file "magnify.exe".
Delete "magnify.exe" by right clicking on it and clicking delete. Do not delete or change anything else, especially if you are unsure about the purpose it serves. Close the registry editor and reboot your computer.