Hi,
you will probably have to reinstall.
Click on Start
Click on "Run"
When the little box pops up, type:
regsvr32 /u %windir%\system32\shimgvw.dll
A process should start.
When that process has completed,
Click on Start, then Run... and type in:
regsvr32 /i %windir%\system32\shimgvw.dll
This should reinstall the Windows Fax and Picture Viewer on your computer.
(You may have to reboot after this for it to work.)
HTH