How do I transfer from HTC SENSE to the computer?
One way would be to use WebSharing Lite available at Google Play/Android market. Once installed, you can navigate to an address set up by WebSharing via your computer and transfer any files you need.

EDIT: 
There are many applications to do this as pointed out by @richard-borcsik below. This is just one off the top of my head. If you establish a Google Account for your android device and then log into Gmail for that Google Account, the contacts that you have on the phone/device automatically show up in your Gmail Contacts list. At least, that has been my experience. So you may not really need a separate application to transfer/update contacts.