Vista - Vista upgrade from xp

I have a wierd one. I have a customers computer that was running xp pro, I did the compatability check for an upgrade everything was good. I did the upgrade correctly. The machine rebooted the final time and said user and login incorrect? so I clicked ok and was brought to the login screen "administrator" and entered my password. No problem got right in. There were some software issues etc etc nothing major. I then went to microsoft and started the update process, specifically the updates for windows and other stuff IE hardware etc. I did the active x...then the update failed it said that I have to log in as an administrator...hmmmm

let me back up, during the upgrade it failed at first and said that have to remove the C:\user folder or rename it....I went into c and renamed it user1....then the upgrade went smooth.....

So after that failure (the updates) i went back into the C drive and realized that there was now two USER folders the one I renamed and the one that is supposed to be there. Well I promptly fixed the renamed folder back to user NOT USER(caps intentional) vista asked me if I wanted to merge the two folders, I said sure and did that. Well now it appears that I have two admin accounts but still can't run the updater, I tried logging out and then logging into the "other" admin account and no go again.

I did alot of research and haven't been able to find an answer. I hope one of the gurus here can point me in the right direction. I have tons of Vista experience and frankly have been using w7 so long now I am getting rusty, generally I just do a fresh install, however the customer really has to have his data in tact. So I am thinking I should be asking before I blow it totally. Now just in case, I do have the ability to upgrade from Business to Ultimate if that is a viable option. thanx all

Vista is not so good when Windows 7 will come out soon. to upgrade your system to Windows 7, some software may help you about the disk , such as to do backup, genie backup.

I know but my customer is adament about Vista and they did pay for the upgrade already..LOL

You may find this option may help Clean Install From Upgrade Vista
but you will have to back up and reinstall all your customers data & drivers, I hope this link is of some help all the best