The best replacement for webroot is norton.

The best alternatives to webroot are rated as following:
★★★★★  norton
★★★★  kaspersky
★★★  mcafee
★★★  avast
★★★  avg
★★  trend micro
★★  bitdefender
★  norton 360
★  windows defender
★  microsoft security essentials
★  eset
★  bitdefender 2011
★  malwarebytes
★  sophos
  norton antivirus
  trend
  lookout
  symantec
  eset nod32
  norton internet security
  avast which is better
  vipre
  bitdefender 2013
  trend antivirus
  avira
  panda
  spybot

Your alternative for webroot is not listed? Suggest!
Speaking about webroot, one probably shouldn't forget about windows firewall.

Other search terms related to webroot and their ratings are:
★★★★★ windows firewall
★★★ uninstalling my 2011 webroot
You have in mind a companion for webroot and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of webroot in all years. Click on graph for more.
webroot
norton
kaspersky