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Memory Tweak
Edit the vcache section of the System.ini file. The following example shows what to add under the vcache section of the file.
[vcache]
maxfilecache=6144
Why does this work and what does it do? Taken from Article ID:Q225497 from Microsoft:
PRB: Windows 95 May Fail to Boot Due to I/O Subsystem Failure
Under some circumstances Windows 95 may fail to boot, and will display the following error message:
Error: An I/O subsystem driver failed to load Either a file in the .\iosubsys subdirectory is corrupt or the system is low on memory.
This problem may occur when all memory below 1MB is allocated prior to
initialization of Ios.vxd. Ios.vxd must allocate memory below 1MB for use as
real-mode buffers. If Ios.vxd can't allocate this memory, it fails to load,
which in turn causes Windows 95 to fail to boot.
Memory below 1MB is typically reserved for components that specifically request
it. However, it is possible that Windows 95 will allocate all memory between 1MB
and 16MB during initialization, forcing system DMA buffers (which must lie below
16MB) below 1MB, and therefore preventing Ios.vxd from being able to allocate
memory below 1MB.
This problem can be worked around by adjusting the maximum cache size
allocated by Vcache.vxd. Vcache.vxd allocates an initial cache size that is no
larger than 9MB. Setting the maximum cache size to less than 9MB also reduces
the initial cache size, freeing up memory below 16MB and allowing Windows 95 to
boot properly.
The maximum cache size is set by adding a "maxfilecache" line to the
vcache section of System.ini. The following example shows what an entry in
System.ini would look like to set the maximum cache size to 6MB:
[vcache]
maxfilecache=6144
This is a known problem in Windows 95. It has been fixed for Windows 98.