When Windows 7 and Vista are installed on a system which has a high resolution monitor, the display adapter detects this, at the time of installation and sets the display font size to 125%
When you reset the font size to 100%, it impacts on MS Access. MS Sans Serif disappears from the available font list.
MS Access appears normal in Windows XP:
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The effect is to screw up the way that some fonts render – where a Microsoft Access database uses MS Sans Serif, a substitute font is used which renders as a larger font. (This distortion may also happen other applications which use the same font – see this post)
MS Sans Serif is Missing in Windows 7:

To fix it you need to add the following to the registry:
Open a blank text file and copy in the following between the lines of asterisks
*****************************************************************
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionFonts]
“MS Sans Serif 8,10,12,14,18,24″=”SSERIFE.FON”
“MS Serif 8,10,12,14,18,24″=”SERIFE.FON”
“Courier 10,12,15″=”COURE.FON”
*****************************************************************
Save as FontFix.reg, or download it from here then unzip it, double click the file and add it to the registry.
Log off and log on again and when you look in the list of fonts MS Sans Serif will have returned
Before – MS Sans Serif missing:

After – MS Sans Serif present:

The articles below explain in detail:
Windows 7, bitmap fonts and Microsoft Dynamics GP
More on Windows 7, bitmap fonts and DPI settings
See also Free Download Windows 7 – Create a Windows 7 Installation DVD or USB Flash Drive

can fonts ms sans serif