Hello and welcome.
First for the connection try these...
Please click Start > Run, type inetcpl.cpl
in the runbox and press enter.
Click the Connections
tab and click the LAN settings
Verify if "Use a proxy..." is checked, if so, UN
check it and click OK/OK
Now check if the internet is working again.
Go to Start ... Run and type in cmd
A dos Window will appear.
Type in the dos window: netsh winsock reset
Click on the enter
your system to complete the process.
Now run SFC
Please run SFC (System File Checker)
Please run System File Checker sfc /scannow
... For more information on this tool see How To Use Sfc.exe To Repair System FilesNOTE for Vista/WIN 7 users..The command needs to be run from an Elevated Command Prompt.
Click Start, type cmd
into the Start/Search box,
in the list above and select 'Run as Administrator
You will need your operating system CD handy.
Open Windows Task Manager....by pressing CTRL+SHIFT+ESC
Then click File
.. then New Task(Run)
In the box that opens type sfc /scannow
......There is a space between c and /
Let it run and insert the CD when asked.