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Vista 64 bit OS did not accept the driver for the USB to DB25 parallel cable. Message says the driver must have a digital signature.

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Until a new version for 64-bit Vista comes out, there are two workarounds:
1. Boot Windows holding down the F8 key and select “Disable driver signature enforcement”. This will let you install unsigned drivers for that session.
2. Run cmd.exe as an administrator (right-click it to do this) and then type:
bcdedit -set loadoptions DDISABLE_INTEGRITY_CHECKS

post again if you have problems.--------- Please rate this solution.---------

Posted on Oct 11, 2008

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You need to connect the printer with an extra cable which can join it through its 25 pin parallel cable. That cable then with USB end connect with the Laptop. and its drivers can be automatically detect by your Vista system.
For Vista 64-bit, the driver for printer and cable should be digitally signed.
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The 64-bit version of Windows Vista is the first version of Windows that will only allow signed drivers and this restriction is built-in. For most cable drivers are unsigned and we request you to follow some prerequisites before installing the driver.
Preparing Vista 64-bit for Driver installation:
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And for printer driver if you dont have CD then go through this link and follow the steps:
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Let me know if you need furhter assistance, I will help you to run your Printer with Laptop.

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Vista 64 bit OS says I must get a driver with a digital signature to install USB to DB25 parallel cable. The driver on the disc which came with the cable was not accepted by Vista.


1. Get a new signed driver from the adapter manufacturer.
2. Try the workarounds listed here: http://www.mydigitallife.info/2007/08/15/workaround-for-vista-cannot-load-low-level-driver-signing-issue/

For what it is worth, I generally found USB to parallel adapters worthless as most printers will not work with the adapter. Usually easier to get a new printer. If a desktop, get a parallel port expansion card.

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