PEChecksum

Written in C, PEChecksum is a command-line utility that gives you the possibility to view and update the checksums of PE items, such as EXE, DLL, OCX, DRV, SYS and MUI files. It offers support for 32-bit and 64-bit files.
Checksums must be updated when it comes to system files if their resources or other data is changed. The command-line switches are treated as files to update checksums for.
The downloaded executable file is lightweight and doesnt require installation. You can save it in any part of the hard drive or a removable storage unit, in order to launch the tool on any computer with minimum effort and no previous setups.
The process can be called from a simple Command Prompt dialog, where its necessary to go to PEChecksums location on the disk, as well as to write its name and format, followed by the name and extension of the PE file you want to analyze for checksum. The application should display a message in the form of "Checksum did not change from 0X0..". Otherwise, if you try to access unsupported files, it says "Could not be opened: 0x00..".
The programs source code is also available for download at the developers website.