We use cookies to provide you with a better experience. If you continue to use this site, we'll assume you're happy with this. Alternatively, click here to find out how to manage these cookies

hide cookie message
2,862 Tutorials

How to fix 'URL not valid' messages

Fix hyperlink security problems

QUESTION When clicking on a hyperlink in Mozilla Firefox I often get a warning that the ‘URL is not valid and cannot be loaded’, even when I know it’s genuine. My PC runs Symantec Norton Internet Security 2010 and a-squared Anti-Malware, but I can’t find any settings to adjust to prevent this happening. Martin Perry

HELPROOM ANSWER You shouldn’t be running both Norton and A-Squared, Martin. Running two security products that provide the same function simultaneously can cause them to clash, producing random behaviour problems.

If you’re unable to uninstall A-Squared using Add/Remove Programs, you may need to boot the PC into Safe mode first.

The error message you’re receiving is likely to be caused by a Firefox browser add-on (although the Google Toolbar is often wrongly blamed). In Firefox go to Tools, Add-ons and disable all entries. If all is well after restarting the browser, enable each add-on in turn to identify the culprit.

See also: How to fix everything: the ultimate guide to fixing technology

Get free tech support 24 hours a day at PC Advisor's Helproom Forum

IDG UK Sites

Samsung Galaxy S5 mini vs HTC One mini 2 comparison review: Design and price beats additional...

IDG UK Sites

Why local multiplayer gaming is rapidly vanishing: we look at the demise of split-screen and LAN...

IDG UK Sites

Colour-depth not resolution is what will make 4K a success or failure

IDG UK Sites

iPhone 6 vs iPhone 6 Plus: Which new iPhone 6 model should I buy?