doArp can only handle IPv4 addresses error

[Keshava Bharadwaj <kb.sankethi () gmail com>]

I am trying to use nmap on windows
d:\>nmap -version
Nmap version 5.51 ( http://nmap.org )

whenever i 'nmap' on a system, i always get the error -

d:\>nmap -sVC -O -T4 15.154.62.175

Starting Nmap 5.51 ( http://nmap.org ) at 2012-04-03 21:51 India Standard
Time
doArp can only handle IPv4 addresses

and if i run using --unprivileged option, i still get error even though i
am administrator( admin privileges )
d:\>nmap -sVC -O -T4 --unprivileged 15.154.62.175
TCP/IP fingerprinting (for OS scan) requires root privileges.
QUITTING!

Any idea on how to solve this problem ?

Thanks..
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