Hooking problem, random crashes

Behaviour of Windows was unstable, from time to time some program
crashed, alone or with windows. E.g. mouse move in CHARMAP.EXE
causes program crash, in WINPOPUP.EXE Windows crash, some installation programs
erect "blue window" and TWAIN scanner driver opens system modal error window.
Problem is in nVidia desktop extension - **nView**. In program was incorrect
hook (tweak) - nView item appears in all system menus. Another program
which would like to make a hook too, crashes. Solution: don't use nView hooking, i.e.
delete register key `HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\nView
"rundll32.exe nview.dll,nViewLoadHook"`.