My Windows 7 has lost its internet connection

[mobile1]

My Windows 7 desktop PC has lost its internet connection. It is connected over wi-fi.

I tried doing this in CMD:

ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renew
NETSH winsock reset catalog
NETSH int ipv4 reset reset.log
NETSH int ipv6 reset reset.log


This did not work.

I also get an error dialog on startup that says:
The program can't start because DNSAPI.DLL is missing...

Yet dnsapi.dll is in the Windows/System32 folder.

Is there any software that can fix this?


Can anyone suggest ways to restore the connection?


Thank you for your help.

 

[UsernameIssues]

Try these steps:
http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

 

[mobile1]

Try these steps:
http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

Tried it. No luck.

I changed from wireless to an ethernet wire.

I cannot ping my router.

 

[UsernameIssues]

When do you get the error that DNSAPI.DLL is missing?

Please answer what you can from this post:
http://www.sevenforums.com/network-...ts-before-posting-your-networking-thread.html