Unable to delete printer driver from Windows 7

In my case user was running on windows 7 x86 sp1, and was complaining that he can't print because printers doesn't exists on his computer. Printers should be installed using group policy preferences, so I have started to troubleshoot the problem. Printer spooler was stopped, and that was the reason why the user doesn't see printers in control panel. Printer spooler was stopping whenever group policy for installing printers was applying. So, I wanted to delete all unnecessary printer drivers that were installed. After opening Print Management mmc there were a lot of printers drivers that were not in use, and I started to remove drivers packages that were not in use. For the most of them removing was running smoothly, but there was one that was refusing to delete complaining that :

"The specified printer driver is currently in use. Failed to remove package ..."

I have tried a lot of the suggested solutions, but none of them helped me to delete the driver package. The only way that I have succeeded to delete the driver package was to rename the print processor from registry in my case HKLM\SYSTEM\CurrentControlSet\Control\Print\Environments\Windows NT x86\Print Processors\ , and then delete the driver package from print management console.
Printers defined in GPO have successfully installed, and user was able to print documents.