Pics problem!

[ivconic]

Recently i changed my old pc with new one. It has XP SP3 installed now. I installed Opera and Google Chrome along with existing IE.
I have huge problem; opening these pages same as any other, sometimes i can see attached pics and photos and sometimes i can not??? Same problem with all 3 browsers. IMG code is ON. Sometimes i simply open these pages and can NOT see posted photos and usually i see only "pic.jpg" ...etc...etc..
I tried almost everything. I rechecked preferences and tools sections in all 3 browsers?? No result. Everything seems to be correctly adjusted, yet i still have problem. I never had similar problem with my old pc and XP SP1.
I guess this is related to OS not to browsers? Maybe SP3 is making problems?
Also have installed Avira antivirus. Related?
Kind of "floating" and random problem?
I just opened these forums and now i can see posted photos? Minute before i could not? Next time i will also face same problem? Damn!
Anybody have a clue?
I hate this situation, and am ready to format hard disk and install SP1.
I used SP1 for many years without any problems. SP3 looks like huge BS to me!
Any ideas?