Hi,
Those are legitimate HP files from a printer probably, see this:
http://www.wilderssecurity.com/showthread.php?p=1293859
Explains things and shows you that you can Restore the files out of the Vault...also note about the latest update from AVG....usually, these FP's are being seen in the newer version 8 of AVG- you've probably had a major
program update so you are using the newer scanning engine....whatever caused it, it's a false positive....
For your user account, to change your email details, you click on "My Account" at top of the page....next, down to the category on your left side....."Edit Email and Password".....follow what it tells you there.