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icmp.dll (ICMP Library) - Details
Icmp.dll is required for windows to operate. ICMP (Internet Control Message Protocol) is used when networking. It ensures the integrity of information being sent across a network. If icmp.dll is unavailable Windows will not be able to communicate with any other comoputer (for example over the internet).
icmp.dll is flagged as a system process and does not appear to be a security risk. However, removing ICMP Library may adversly impact your system.
I have icmp.dll in 3 directories in my windows dir. (Win XP - SP2)
You might wanna check if imcp.dll is missing in one of these directories. (remember to turn on the 'show hidden / system files' thing).