BP Corporate Theme - Font Display in IE, Safari , Firefox

Hi All,

Not sure why, but when I view my BP Corporate Theme pages (for example: http://www.networkit.com/getting-started/enhance-careers/ ) no matte whether in IE, Firefox or Safari (all on PC) - the fonts look horrible. Really jagged looking.

Weird thing however, when I view it on my iMac .... in Safari .... fonts look great. Can you advise what I need to do so that PC users can view my site without gagging. Much thanks!