Open the System.ini file in a text editor, such as Notepad.
Go to the [vcache] section.
Add these lines, or change the settings to this, directly under [vcache]:
MinFileCache=4096
MaxFileCache=131072
Save the changes and reboot.
Then go directly to the BIOS, and try to open the AGP aperture to 256, if the BIOS supports an aperture that large. That's pretty standard with 512MB of RAM. 1/2 the size of the physically-installed memory.
The vcache is basically a set of memory addresses for the disk caching virtual device driver.
In Win9x, when you install 512MB of RAM or more, a bug in the OS correspondingly raises the size of the vcache, and this can become as large as 800MB when controlled by Windows. But the vcache settings must always be smaller than the size of the physically installed RAM, or it can cause blue screens and out-of-memory errors.
Also, the AGP port uses a set of memory addresses that are very close to the vcache. This is a cache for texturing, and so, for example, if you have a video card with 32MB of RAM, another 32MB is allocated for AGP texturing. If these addresses overlap, the again, you get blue screens.
The settings I posted for you caused the minimum size of the cache to be 4MB, which is good for performance. The maximum number set the upper limit for the cache at 128MB, which is not only sufficient for the virtual device driver and the cache, but also better for performance. The standard rule-of-thumb in this kind of situation is that the maximum number is really the important one, and that it should be set at around 25% of your RAM.
After making the changes, the memory addresses cannot overlap and cause a protection fault when the disk caching virtual device driver and the AGP port start fighting over the RAM addresses during the boot, which is exactly what was happening on your machine.
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