O texto abaixo foi tirado de um artigo da base de conhecimento que se aplica ao Windows XP, mas você pode replicar as etapas no Windows 7 e veja se faz alguma diferença:
- Click Start, right-click My Computer, and then click Manage.
- Double-click Services and Applications, and then double-click Services.
- Right-click Telephony, and then click Properties.
- On the General tab, click Manual next to Startup type.
- On the General tab, click Start under Service status, and then click OK.
- Repeat steps 3 - 5 for the Remote Access Connection Manager service and for the Remote Access Auto Connection Manager service.