1- If you have AVG Safe Search installed then it is defiantly worth disabling it then retrying the search 2-Try updating to Firefox 4 3- Run a malware scan, it is very unlikely that this is the case. However it is important to remember that malware isn't always a virus, so your computer could just have a little problem that is easily fixed by a program like malwarebytes or super-anti spyware.

I had this same issue, started beginning of April '11 and disabling the AVG Linkj-scanner/Search Shield did resolve this issue temporarily. Course I'm still using 3.5

Thanks a lot... The problem is fixed!! I've upgraded to FF4 and run a full computer scan using Ad-Aware.

I'm not sure what actually solved the problem ( the upgrade or the malware scan) but the bottom line - I search images again  :)

Thank you for the help