You have malware on the PC, please run a good anti-malware scanner and consider installing a good antivirus app.
There have been some good suggestions on this
thread. If you need good security software then please consider checking the ratings of the software by using something like
Gizmos Freeware, which is independent. The best-advertised apps (like Norton) generally don't do well in comparative tests.
- If you install Avast a/v then you are unlikely to experience the sort of issues you describe.
- If you don't have an effective AV and have malware (especially affecting a browser), then Malwarebytes is a good scanner/remover.
- Avoid Internet Exploder as historically it has always been the worst browser for getting malware on a PC. Every new version is touted as being better than the last, but they still have a long way to go to equal others such as Firefox or Opera. Admittedly this is contributed to by the amount of attacks on IE and not on Ffox etc - it will be attacked most, because attackers figure that anyone using IE will be less likely to know about security software.
- Outlook Express email app is just as bad (maybe worse). You will certainly get 10x more malware by using Outlook Express instead of something far more secure such as Thunderbird.
- A good firewall is also useful, although the best, such as Online Armor, are too difficult for the average user to manage properly. Otherwise, make sure Windows Firewall is turned on.