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".....I've got a 755C. I want to be able to use a few 32-bit windows applications, but everytime I try and execute one, I get a "DOS error 21" message in a window. Does anyone know what causes this?...." ~~~~~~~~~~ I don't know how this relates specifically to thinkpads, but I've seen this error on several of our machines, including the thinkpads, when first installing 32-bit apps. What I've done is turn on 32-Bit File Access in Control Panel, 386Enh, and set the smartdrv.exe windows parameter to 512 (if there's no parameter set, I think it defaults to 128) in the autoexec.bat: C:\WINDOWS\SMARTDRV.EXE 1024 512 The first number is the DOS buffer size & the second is the Windows buffer. Without this parameter, or with it set to a lower number, I've seen "Unexpected Dos Error", "DOS Error 21", and "EMM386 has detected....... reboot your machine" errors. Hope this helps. Michael J. Verne michael_verne@vmedia.com Systems Analyst, Ventana Communications Group, Inc.