In some cases, unidrv.dll errors could indicate a registry problem, a virus or malware issue, or even a hardware failure.
Unidrv.dll Errors
There are several different ways that unidrv.dll errors can show up on your computer. Here are some of the more common ways that you might see unidrv.dll errors.
Unidrv.dll Not FoundThis application failed to start because unidrv.dll was not found. Re-installing the application may fix this problemCannot find [PATH]\unidrv.dllThe file unidrv.dll is missingCannot start [APPLICATION]. A required component is missing: unidrv.dll. Please install [APPLICATION] again
The unidrv.dll file is associated with Microsoft’s Universal Printer Driver. It’s normally stored in a folder like C:\WINDOWS\system32\spool\drivers\w32x86\ or within a subfolder of C:\Windows\System32\DriverStore\FileRepository. The context of the unidrv.dll error is an important piece of information that will be helpful while solving the problem. Unidrv.dll error messages might appear while using or installing certain programs, when Windows starts or shuts down, or maybe even during a Windows installation.
How to Fix Unidrv.dll Errors
Need More Help?
If you’re not interested in fixing this problem yourself, see How Do I Get My Computer Fixed? for a full list of your support options, plus help with everything along the way like figuring out repair costs, getting your files off, choosing a repair service, and a whole lot more. If you suspect that you’ve accidentally deleted unidrv.dll but you’ve already emptied the Recycle Bin, you may be able to recover unidrv.dll with a free file recovery program. Probably the easiest way to update this print driver is to install any missing Windows updates (Step 5), but using a driver updater tool could be useful, too. Reinstall the printer driver using these instructions if you’re using Windows 3.1. To do this, open the C:\Windows\Driver Cache\i386\ folder and look for a service pack CAB file, like sp3.cab if Windows XP is updated to service pack 3. Open the CAB file with a file unzip tool like 7-Zip and then copy the unidrv.dll file out of it. We rarely recommend the use of registry cleaners. They’re included as an option here as a “last resort” attempt before the destructive step coming up next.
