De acordo com a tabela abaixo, você precisa de uma instalação personalizada (limpa). Eu recomendo que você execute Consultor de atualização do Windows 7 .
Download and run the Windows 7 Upgrade Advisor to see if your PC is ready for Windows 7. It scans your hardware, devices, and installed programs for known compatibility issues, gives you guidance on how to resolve potential issues found, and recommends what to do before you upgrade.