I had a similar problem last night. XP sp2, 512 RAM, using both Internet Explorer 6 and Mozilla 1.7.2, and Kerio 2.1.5 firewall.

I started having trouble with Internet Explorer. Part of the page would load, and other parts remain empty. Also, the fonts changed on the various sites to a very small size. I switched to Mozilla and it worked for a while and then the same thing began to happen. This was the same on every site I visited, including this forum. No matter what I did, the problem persisted until I shut down the computer for the night. Today, it’s all normal again.

My first thought was that it was because I hadn’t shut down the computer in a couple of weeks and it was Windows telling me it was time. After seeing this thread, I thought I should comment on the problem.