[TYPO3] FE page doesn't popup anymore after installing IE7

[CAnet // Alessandro Canè]

IE7 error details say:

line: 582
character: 1
error: property or method non supported by the object
code: 0
URL: "mydomain"/typo3conf/ext/templavoila/mod1/index.php

(i did those translations above, from my italian version of ie)

I've already disabled pop-up block, of course and if I use a different pc everything works fine, how comes? any suggestion?
It should be some IE setting, but..... 

tnx!