Irfanview does files batch conversions.
Unless you installed a BT version of IE over the Tiscali equivalent, then the title bar won't change.
You can eliminate the branding entirely either by the built-in method:
First close down Internet Explorer then click Start and Run. In the Open
dialog box type:
(note the space after .exe and comma before Clear)
and click OK. Probably best to Cut and Paste the line.
After restarting Internet Explorer the annoying ISP branding should disappear.
Or, if you have SpywareBlaster, go to Tools>IE options and just type in what you would prefer to Tiscali.
I've got my own name, purely on vanity grounds....