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Well you'll have to apply the cure for the 49 days bug.
Early versions of Windows 98 crash every 49 days like Windows 95. If you used it as a desktop you would never notice it but when it runs only one program 24/7 it lock's up eventually Edited 2012-03-05 19:43 UTC
Regarding win-9x hanging after 49 days:
This was an issue for win-95 and win-98FE (first edition aka standard edition). This kb article gives a fix for win-95/98. Win-98se did not need the fix because it did not have this problem.
Oh - as for the comment about 95 or 98 being "dos based" - that's an urban myth. The 9x/me line were full win32 OS's that put the CPU in protected 32-bit mode (something DOS doesn't do). 9x/me is *launched* or started / booted from DOS, but immediately puts the CPU into protected mode and wipes DOS from memory (or, more specifically, it creates a virtual environment for DOS so it can run as a virtual process that can be used by any legacy software that needs to run 16-bit code).
Win-9x/me itself will use 16-bit DOS functions if called for by any hardware drivers - but this is a "handicap" or deficiency of the driver not the OS. It was anticipated that during the transition from DOS and Win-3.x that Win-9x would have to be compatible with legacy 16-bit software - including drivers. Naturally this situation disappeared in a few years as all code became 32-bit.