If you’re running Windows XP Professional, a few different WFP-related settings can be configured using the Group Policy MMC. To access this tool, open the Run command, type gpedit.msc, and click OK. WFP settings are found under Computer Configuration > Administrative Templates > System > Windows File Protection.
The four main configurable settings found in this section include:
Set Windows File Protection scanning – allows you to control whether system file scanning will occur during startup.
Hide the file scan progress window – controls whether the scan progress window appears when commands like sfc /scannow are issued.
Limit Windows File Protection cache size – Allows you to set a maximum size, in MB, for the size of the dllcache folder. This setting is configures the same setting as the sfc /cachesize command.
Specify the Windows File Protection cache location – Allows you to control the location of the folder where system files are cached, typically %systemroot%\system32\dllcache by default. This method of changing the setting is recommended over editing the Registry directly.
In a similar manner, driver signing options can also be configured from the Group Policy MMC. This setting is found under Computer Configuration > Windows Settings > Local Policies > Security Options. Change the setting of the Devices: Unsigned driver installation behavior to configure your system to Ignore, Warn, or Block when unsigned driver installation is attempted.