Thunking Spooler apis from 32 to 64 Process Has Stopped

These problems occur because of an issue with the Splwow64.exe process. To resolve this issue, first try to install the lates updates from windows update and check. If not, download the hotfix mentioned in the below article:

You experience problems when you try to print a document in a 32-bit program on a computer that is running a 64-bit version of Windows Vista: KB Article

If this doesn’t help, try enabling the following:
“Click” > Start > Control panel > Internet Options > Advanced Tab > Security Section. Select the following three options:

  1. Allow active content fro CDs to run on My computer
  2. Allow active content to run files on My Computer
  3. Allow software to run or install even if the signature is invalid.

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