I have a bizzare issue with my system after receiving windows security updates.
I'm not sure if it was the updates that caused the problem, but virtually all text in my web browser has switched to a very small serif font.
I have a similar issue when printing, everything prints tiny. Its the same for other applications such as text in iTunes has decided to become a tiny serif font.
All my fonts are in tact because Word runs fine.
Unfortunately I cannot run system restore or whatever the Windows equivelant of time machine is. I had to turn this off as well as backups due to the huge amounts of data I store - being in the video production industry.
Hope there is a solution other than formatting my system drive and starting fresh.