Itunes not working and I am connected to internet it wond update and i keep getting and error message

I need help in working out this problem I am rtrying to sort out why my computer will not update and i am connnected to internet is it better to remove and install again if so which is the best way to do this as i am getting error messages when i try to update or connect to itunes store.  telling me i am not connected.
Thanks  Lisa

Try this support document http://support.apple.com/kb/TS3694 and look at this section.
Unable to contact the iOS software update server gs.apple.com
Error 1004, 1013, 1638, 3194: These errors may be the result of the connection to gs.apple.com being redirected or blocked. Follow these steps to resolve these errors: 
Install the latest version of iTunes.
Check security software. Ensure that communication to gs.apple.com is allowed. Follow this article for assistance with security software. iTunes for Windows: Troubleshooting security software issues.
Check the hosts file. The restore will fail if there is an active entry to redirect gs.apple.com. Follow iTunes: Advanced iTunes Store troubleshooting to edit the hosts file or revert to a default hosts file. See section "Blocked by configuration: (Mac OS X/Windows) > Rebuild network information".
Try to restore from another known-good computer and network.
If the errors persist on another computer, the device may need service.

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