hi, I use quickstart include virtuemart and k2 and I upgraded to last version
when I unistall k2, virtuemart not worked checkout ! ,virtuemart dependent this plugin 'system-k2'
and k2 caused, show page login before respect to checkout
and register page don't want show fields k2, I need only user and password and email not more
plz help me, sorry abut not good my english

You need to advise your template provider (where you got the quickstart package) and ask them about incompatibilities with latest versions of K2. Probably the package you have had already several modification installed.

I can accept login before checkout but can't accept k2 register form, I would not have fields k2
tnx

A question: Is the registration form coming from K2 or Virtuemart?
If it is coming from K2, then you need to check if you have any K2 template overrides in your package and disable them (just check if you have a com_k2 folder in templates/Your_template/html and rename it). That way you will load the default K2 template and check if the registration form works then.

I have not template to folder com_k2/templates there is just default folder
see zoombox.ir/index.php?option=com_users&view=registration
I would not want personal detail

I need you to take a look in this folder path:

templates/Your_template/html/com_k2

If com_k2 exists try to rename it in order to check with the default K2 template coming from the component and not your template which will probably has modifications.

in the same address templates\gk_storebox\html\com_k2\templates
and this address components\com_k2\templates
just one folder the name default
There is no another folder for rename
I'm not good read and write english ! To properly you've discovered?

I installed k2 to new joomla
I see again Personal Details to register
I don't think relationship with template

Check if the User - Profile plugin is Disabled. It is located under Extensions -> Plug-in Manager.

Does not work, just when disabled system-k2 it's okay
but when disable system-k2 will not be added to cart products