Prevent Keylogging

[SirJosh3917]

Hello, I have a simple login application that uses MD5 hash to hash user logins, then compare them.
After they login they get to go do stuff.
What I'm worried about is the user running a malicious batch file.
If you spam input in CMD and type

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doskey /history

a history of what you typed will be outputted to the screen.
This could go into a file and then so much for the MD5 hash, you have their password.

My question is, how can you make doskey clear the history?

[Squashman]

Can't test this from my phone but the help file says

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/REINSTALL         Install a new copy of Doskey (clears the buffer).

Figured we had discussed this in the past.
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