That sounds like a problem caused by ClearType. Here is a website for a tuner to correct it - http://go.microsoft.com/fwlink/?LinkId=62457
Or you can turn off ClearType. To turn it off do the following:
1. In Internet Explorer, click the Tools button, and then click Internet Options.
2. Click the Advanced tab, scroll to the Multimedia section, clear the Always use Clear Type for HTML check box, and then click OK.
The changes will take effect the next time you start Internet Explorer