I have a strange issue: When I launch Firefox 12 nothing happen and Windows becomes very very slow, only the explorer. For example, when I hover the mouse over the task bar the tool tip takes 1 second to appear, and opening start menu takes also long time.
But, if you switch to a running application (Chrome for example), it is responding properly, and you can open a website and interact with it. After a while (about 15 minutes) suddenly Firefox starts, and Windows gets normal.
I tried to scan for viruses with no luck, I'm using Microsoft Security Essentials.
I tried to run Firefox in safe mode also with no luck.
I tried to update to v13.
I tried to delete the profile and created new one, disabling all the extensions.
Doesn't solve anything! Can anyone guide me how to figure out if there is a trojan or spyware?