http://research.sunbelt-software.com...threatid=44159
Haxdoor.Fam=malware=trojan downloader=one place found with removal instructions=
http://www.sophos.com/support/disinfection/trojan.html
The name of the file seen on your machine is an alias for this particular trojan that can allow remote access to your machine as well as downloading other spywares for stealing passwords and other data. AVG is excellent at spotting the types of things missed by other programs while not always being able to quaranteen or remove.
The number #2 + #3 paragraphs at the link above give specific instructions for removing this. The following two items could use a little removal themselves.
R3 - URLSearchHook: (no name) - {00A6FAF6-072E-44cf-8957-5838F569A31D} - blank (file missing)
O20 - Winlogon Notify: rxx5ot - rxx5ot.dll (file missing)