CPU running hot and fans maxed out while no programs are running

My 2007 MacBook Pro 3,1 suddenly started running hot (CPU-85°C) and the fans are ramping up to 6000rpm for no apparent reason. Nothing but Firefox running. I just downloaded a new Security update. Is anyone else having these issues? Any fixes out there? Should I be concerned? Thanks.

There are a couple of things to try.
First, I always repair permissions before and after adding anything from Software Update. May be overkill but I've never had any issues with updates on any of the family's eight OSX computers.
Second, are you running any anti-virus software other than ClamXav? Most commercial packages create more Mac trouble than they prevent.
Third, use Activity Monitor (AM) to check for runaway background processes. IMPORTANT: to catch the culprits, you have to change Activity Monitor's default setting of "My Processes" to "All Processes." Otherwise, most of the likely suspects are going to fly under the radar. Also quit any apps you have launched. Click AM's "%CPU" column to sort by how much of the processor each background process is using. Let it run about a minute and observe what shows as the largest users. In either Leopard of Snow Leopard, no background process should show over about 5 percent. If anything is grabbing a lot of cycles, post the process name here and we can help you figure out what it is and how it can be corralled.

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