How to disable Windows Error Reporting (WER)

1) Go to Start , Run , type 'gpedit.msc' (or launch from AD if doing for a domain)
2) Computer Configuration\Administrative Templates\System\Internet Communication Management\Internet Communication settings
3) Enable 'Turn off windows error reporting'
 

Links:
Jordan Bortz : Losing space on Drive C? Check your WER ReportQueue
Technet : Windows Error Reporting