HELP...new computer, new library, NO BACKUP need detailed instructions

Question

Hello all,
I just built my new PC and put win 7 on it the other day. I downloaded the newest itunes and got all my music and such on there, great.
Now the iphone. I just did a backup of it in its current state but there is not one from my old computer. I understand losing music and photos and even having to get apps again, fine, no problem. Its my contacts I am concerned with.
I tried the program Backup!Contacts but when it goes to send the vcard file it doenst send me the file, its messed up, so I dont have a backup of my contacts on ANYTHING and dont want to lose them.
I currently only have Yahoo as my email. I do not have a mail client on my computer (outlook does not come with office 2007 home and student).
Question and help needed, how do I keep my contacts if it syncs to a new library? I understand that like I said, losing music etc will happen, but I cant lose the contacts.
On my previous computer, it deleted contacts on 3 seperate occasions when trying to sync, I did the merge and all that stuff and it all resulted in the same problem. So now what do I do? How do I keep my contacts? How do I get my contacts off my phone once its back on the new library system? I need detailed instructions, as I said before, when I tried this before it just simply delted everything. I am extremely worried that it will happen again. I do not have apple support as I forgot to register for the 2nd year of support before it ran out. I will at some point have to have them backed up because I will be getting a new phone in August or when the newest versions come out since I will be out of contract and get a good deal.
Thanks for the help. I appreciate it. I really need it, Im not an itunes guy except for music, I just dont get the syncing and it confuses me really bad.

Answer 1

Contacts are included with your iPhone's backup, which is updated by iTunes as the first step during the sync process. This link provides the data included with your iPhone's backup.
http://support.apple.com/kb/HT1766
Although contacts are included with your iPhone's backup, contacts are designed to be synced with a supported application on your computer. With Windoze, this can be with Outlook 2003 or 2007 along with syncing calendar events, or with Windows Contacts for syncing contacts only.
When syncing iTunes content and transferring photos from another computer, all iTunes content and photos transferred from a different computer will be erased from your iPhone first, but no other data is touched on your iPhone - especially if you aren't syncing contacts with a supported application on your computer. Your iPhone is not completely erased of all data and certainly not any iPhone settings when transferring iTunes content and photos from another computer.
Before syncing contacts with Windows Contacts, enter one contact in Windows Contacts. Make this contact up if needed, which can be deleted later. This will provide a merge prompt with the first sync with Windows Contacts, which you want to select.