I ran CCleaner this morning, and afterwards, all Ajax functionality stopped working in Chrome. This means no gmail, no facebook, and a lot of work stuff.
After some panic time, here's how I fixed it:
1. Shut down Chrome
2. Go to: C:\Documents and Settings\[YourUserName]\Local Settings\Application Data\Google\Chrome\User Data\Default
3. Delete the "Cache" folder
4. Restart Chrome