The problem is solved, new DWORD regstry record should be added.
HKEY_CURRENT_USER\Software\Synaptics\SynTP\TouchPadPS2
or
HKEY_CURRENT_USER\Software\Synaptics\SynTP\TouchPadPS2TM2843 if exists in registry tree
if 2FingerTapAction exists should change value to 2 (2 means double click, 3 means middle button click). If not exists add new DWORD 32 bit with name 2FingerTabAction with value 2.
Restart windows and after that everything should be OK!