I use these two .reg files to disable screen saver activation when that ¤%& logon script has enabled it.

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Control Panel\D
+esktop]
"SCRNSAVE.EXE"="logon.scr"
"ScreenSaverIsSecure"="1"
"ScreenSaveActive"="1"
"ScreenSaveTimeOut"="0"
[download]

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Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Control Panel\Desktop]
"ScreenSaveTimeOut"="0"
[download]

YMMV

/J