Well, the actual answer mentioned in the comments is that your vim configuration files do not have proper rights to them. In addition to this, the key mappings that you used in your question are not allowed according to the docs:
:help X1Mouse
The X1 and X2 buttons refer to the extra buttons found on mice.
The 'Microsoft Explorer' mouse has these buttons available to the right thumb.
Currently X1 and X2 only work on Win32 environments.
and
:h M-Left
Alt-Left Move cursor to the beginning of the previous word
M = alt.
Put this in your vimrc. Turn on the mouse first:
set mouse=a
map <LeftMouse> <c-o>
Despite the fact that Vim uses inefficient gluing of movements together, if you want to get to any place on the screen, which the mouse solves well and much faster than Vim :)
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