To remove the Image and Fax viewer

In the run box type or paste

"regsvr32 /u shimgvw.dll" (without quotes)

Click OK. 

To Re-enable The Image and Fax Viewer
In the run box type or paste ""regsvr32 shimgvw.dll"" (without quotes)
Click OK.

editor's note: You may have difficulties changing your user account picture if you disable image and fax viewer.