vCenter on web Client keep on spinning

just installed vcenter 5.5 and i have the two issue.

1. when i login to the web client using Administrator@vsphere.local account , i can not create a Datacenter or add hosts. it keep on spinning on the bottom displaying (...Objects)

2. Can not able to log in to the vcenter server using vSphere Client . i tryed all the password and user names but didn't work.

3. How can i my vCenter to my domain so that i can use domain account to login to the vcenter ?

thanks,

B