system
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There are 4000+ variants of agobot and similar network worms, and dozens come up every day, because the sourceCode was published on the net, so any script-kiddy can make their own and spread it…
As to being hit after formatting (while/before updating):
- the average time of infection of an unprotected PC is below 20 minutes…
- you MUST have all the ServicePacks and patches ready and have them APPLIED before EVER connectiong to the inet (after a reformat)
- and/or have a PROPERLY configured Firewall in place BEFORE connecting…
- Users of XP have it exceptionally easy now, as they can just apply ServicePack2 OFFLINE
