Problems with IE7

hello, i wonder if anyone can offer me assistance, my blog goes haywire when viewed through IE7, its fine in Firefox, but its has removed all my posts, and instead has left me with a bunch of <!–[endif]–> tags instead of my articles, which is ensuring the loss of my hair.

I’m assuming its something to do with the stylesheet, or the possible recent wordpress upgrade.

Appologies if this is in the wrong part of the forum…but if someone could help that’d be swell.