http://download.sysinternals.com/files/Hex2Dec.zip

Introduction

Tired of running Calc everytime you want to convert a hexadecimal number to decimal Now you can convert hex to decimal and vice versa with this simple command-line utility.

Usage: hex2dec [hex|decimal]

Include x or 0x as the prefix of the number to specify a hexadecimal value.
e.g. To translate 1233 decimal to hexadecimal: hex2dec 1233
e.g. To translate 0x1233 decimal to hexadecimal: hex2dec 0x1233

http://technet.microsoft.com/en-us/sysinternals/bb896736