Windows - Question of Resolution, When Reading Email Attachment

Environment
  • Microsoft Windows XP
  • Lotus Notes 7.0.X
Introduction
The resolution is gone to be 640 * 480, when reading email attachment. This is caused on his / her account only

Solutions
Have tried many things to try to solve it, however, both are fail

Finally, rebuild the Ntuser.dat, when login next time, by renaming / deleting it

Way to check where is it
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
However, not find why just Lotus Notes gets this problem?