Please download FarbarServiceScanner
and run it on the computer with the issue.
Make sure the following options are checked:
Security Center/Action Center
It will create a log (FSS.txt) in the same directory the tool is run.
Please copy and paste the log to your reply.
Please download MINITOOLBOX
and run it.
Checkmark following boxes:
Report IE Proxy Settings
Report FF Proxy Settings
List content of Hosts
List IP configuration
List Winsock Entries
List last 10 Event Viewer log
List Installed Programs
List Users, Partitions and Memory size
List Devices (problems only)
Click Go and post the result.
If you are unable to do the above create a new account to see if that will solve your issue.