Here's how I solved it:
open pip.exe
in 7zip and extract __main__.py
to Python\Scripts folder.
In my case it was C:\Program Files (x86)\Python27\Scripts
Rename __main__.py
to pip.py
Run it! python pip.py install something
EDIT:
If you want to be able to do pip install something
from anywhere, do this too:
rename pip.py to pip2.py (to avoid import pip errors)
make C:\Program Files (x86)\Python27\pip.bat
with the following contents:
python "C:\Program Files (x86)\Python27\Scripts\pip2.py" %1 %2 %3 %4 %5 %6 %7 %8 %9
add C:\Program Files (x86)\Python27
to your PATH (if is not already)
Run it! pip install something