How can I keep my laptop fan on the entire time?

I have a fan on my laptop that doesn't turn on often enough. The computer doesn't crash, but becomes very laggy.

When the fan turns on the computer starts running fast again.

How can I keep the fan on? I use Acer Aspire 5733Z on Windows 7. I tried SpeedFan but it couldn't detect the fan.

You want the speed on your processor to stay up. instead of a feature where the cpu is slowed down to cool it.

You may find some results in control panel..power options..high performance..change plan settings..changed advanced power settings..processor power management make sure it's minimum-100% plugged in. active cooling. maximum 100%. You may be on that already though.

I'd also suggest using HWinfo, which will show you your cpu speed and temperature, and can show it to you in the tray. And you can see if your CPU is slowing down. Though that software may eat huge amounts of RAM so watch it!

Also this question has some pictures of coolers you can use for your laptop, they'd help keep your CPU cool Are Laptop Cooling Accessories (Pads, external fans, etc.) Effective? and my answer to this question mentions some How to power a 12cm fan from an Eee PC 701 4G?

mini vacuum air extracting usb case cooler cooling fan

That aboe may do wonders for your CPU cooling. I had a laptop where I tried blowing down the vent to cool the CPU, as an alternative to the fan. It worked though was tiring and not practical. But that device pictured that'd do it automatically and permanently if you don't mind that and it sounds like you don't.

or just a regular laptop cooler. Either with one big 12cm fan. Or 2 or 3 smaller ones.

my interest has always been somewhat opposite to yours - which is impossibly difficult and a fools errand, but your errand is easier. you don't mind fan noise so just attach one of those mini-vacuum things.

Option 1:
1. Control Panel
2. Power Options
3. Change Plan Settings
4. Change settings that are currently unavailable
5. Processor Power Managerment
6. System Cooling Policy
7. "Passive" change to "Active"

Option 2:
1. Goto BIOS
2. Disable anything call "CoolnQuiet" or similar.
3. Look for anything say "Keep FAN power ON".