@Pitter,
The answers to these questions will determine the advice given to you:
What type of operating system is on your computer?
Are you currently using a version of Internet Explorer?
If it is a Windows operating system, have you recently done a Microsoft/Windows Update to ensure you have the latest file updates for your computer?
If it is a Windows operating system, what are your settings for the Microsoft/Windows update? Do you have it set to check for, download and install updates automatically or do you have it set to check for and download updates but get your permission before installing them?
Do you have anti-virus software installed and updated on your computer? Have you done a full scan of your computer system in the last few days? Was anything detected for you to decide about an action to take?
Do you have an anti-malware/spyware software installed and updated on your computer? Have you done a full scan of your computer system in the last few days? Was anything detected for you to decide about an action to take?