my ipad is disabled says connect to itunes

If it's showing the disabled screen due to too many incorrect passcode attempts then you will need to connect the iPad to the computer that you normally sync to and you should then be able to reset the iPad and restore/re-sync your content to it (http://support.apple.com/kb/HT1212) - you may need to put the iPad into recovery mode in order to be able to reset it : http://support.apple.com/kb/ht1808

If you do it via a different computer then :

If you restore on a different computer that was never synced with the device, you will be able to unlock the device for use and remove the passcode, but your data will not be present.

i have an samsung computer ?

You will need to use the same process whether it's a PC or a Mac i.e. you may need to put the iPad into recovery mode (there are instructions on that 'ht1808' link), and you should then be able to restore/resync your content to your iPad from your computer's iTunes

it downloads latest os of os and it an error cannot connect to ipad

I'm not entirely sure what your posts means, but if are being asked to enter the iPad's passcode when you connect it to your computer's iTunes then follow the instructions on the second half of this page http://support.apple.com/kb/HT1212 :

Note: If iTunes asks you to enter the passcode, try another computer that you have synced with. Otherwise, go to "If you have never synced your device with iTunes, or you do not have access to a computer" section below.