ZeroAccess Infection

Hi. First post here. I tried registering for this forum weeks ago with gmail and aol email addresses but never received the confirmation emails. Today I resorted to creating a yahoo address which apparently worked.. so my here is my spotty recollection of my problem: I've usually had good luck with Norton products, but a few weeks ago when I installed the new Norton Antivirus (version 19.7.1.5) on my old 2006 Dell E510, Windows XP media center edition, apparently it awoke something because Norton full scan was running for nearly 24 hours and never completed. I had to stop the full scan because it appeared crashed. I then rebooted and did a quick scan and I noticed zeroaccess was found I believe in two instances. I was in the midst of following Norton's instructions for removal, downloaded power erasor and zeroaccess remover, but neither was able to do a complete removal. Then Norton was unable to even open in normal windows mode, and would open but not do a quick scan in safe mode. I then thought the virus corrupted Norton itself, so I uninstalled and reinstalled Norton. Tried to do quck scans again to identify the virus, but had the same problems and was prevented from doing a quick scan. I was reading other threads on this forum and it seems zeroaccess is a crafty virus that sometimes requires custom solutions with which experts here can assist. Many thanks in advance for any help.