Thanks Tech and Polonus.
Before I read Polonus's mail I ran Jotti and got the following result for the pen drive virus ntdetec1.exe
Scanner results
Scan taken on 11 Jan 2008 14:28:34 (GMT)
AntiVir
Found DR/AutoHK.B, TR/AutoHK.B
ArcaVir
Found nothing
Avast
Found nothing
AVG Antivirus
Found Dropper.Generic.TDB, Generic9.AGHB, Generic9.AGHC, Generic9.AGHD, Generic9.AGHF
BitDefender
Found nothing
ClamAV
Found nothing
CPsecure
Found nothing
Dr.Web
Found nothing
F-Prot Antivirus
Found nothing
F-Secure Anti-Virus
Found Trojan.Win32.AutoHK.b, Trojan.Win32.AutoHK.c, Trojan.Win32.AutoHK.d, Trojan.Win32.AutoHK.e
Fortinet
Found nothing
Ikarus
Found Trojan.Win32.AutoHK.b, Trojan.Win32.AutoHK.c, Trojan.Win32.AutoHK.d, Trojan.Win32.AutoHK.e
Kaspersky Anti-Virus
Found Trojan.Win32.AutoHK.b, Trojan.Win32.AutoHK.c, Trojan.Win32.AutoHK.d, Trojan.Win32.AutoHK.e
NOD32
Found nothing
Norman Virus Control
Found nothing
Panda Antivirus
Found nothing
Rising Antivirus
Found nothing
Sophos Antivirus
Found Mal/Generic-A
VirusBuster
Found Trojan.AutoHK.A, Trojan.AutoHK.F, Trojan.AutoHK.B, Trojan.AutoHK.D, Trojan.AutoHK.E, Trojan.AutoHK.C
VBA32
Found Trojan.Win32.AutoHK.e, Trojan.Win32.AutoHK.c, Trojan.Win32.AutoHK.d
Let me try the suggestion given by polonus.
Thanks again