Hi there this sounds like a proxy problem

First

Go to Control Panel and select Internet Options
Select the Connections TAB
Select LAN settings button
Ensure there is no tick in the Proxy Server box
Select OK and restart Internet explorer

And for Firefox there are instructions on this page and you want the setting to be no proxy

Then

Download OTL to your Desktop

[*]Double click on the icon to run it. Make sure all other windows are closed and to let it run uninterrupted.
[*]Select All Users
[*]Under the Custom Scan box paste this in

netsvcs
%SYSTEMDRIVE%*.exe
/md5start
explorer.exe
winlogon.exe
Userinit.exe
svchost.exe
/md5stop
%systemroot%*. /mp /s
CREATERESTOREPOINT

[*]Click the Quick Scan button. Do not change any settings unless otherwise told to do so. The scan wont take long.

[*]When the scan completes, it will open two notepad windows. OTL.Txt and Extras.Txt. These are saved in the same location as OTL.
[*]Post both logs