Ok, I am just about to give up entirely on this product
" /> . I have uninistalled v10 using the uninstall toll and rebooted. I have re-installed the Apr18 version and rebooted. I have downloaded and ran the weekly.exe for v10 and rebooted. Further, I have attempted to contact tech support (several times) and gave up after waiting for 90 minutes each time. I am seriously considering seeking my money back for thsi product and going elsewhere.
After doing all this, I still continue to experience update failures. There is no problem with my install contacting the update server initially and checking routine (it appears). It even provides me with a prompt of the updates that needed to be downloaded. The problem continues to be as the updates are being downloaded to my PC, the Update percentage progress bar indicates 30%, 66%, 100%, 174%, 180948%, etc. All the while the file progression download status hangs at 0% then goes back to checking, the updating....and ultimately the entire update fails with an error "could not contact update server".
Additionally, I have checked my XP Home Office firewall settings and there is no issue there.
Does anyone have any further suggestions? I am just about at wits end with this product and the support provided. One would think update problems originated by vendor code bugs would be met with rapid tech support in order to keep customers happy. Heck, the amount of downtime this has caused me, I could have gone with another av product. 
thanks for any help on this.