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First thing I'd check is for a BIOS update for your computer under the Acer support pages (acer.com). In some cases, thermal control updates are included in newer version of the BIOS, if it is a manufacturing problem.
Goto http://www.cpuid.com/hwmonitor.php and download Hardware Monitor, start the computer and immediately run the hardware monitor app to check how high the temperature on the CPU gets before it shuts down.
Continuing use under this condition may damage your Windows installation because of the sudden shutdown.
Try to cool the laptop in the sense, do not use it for some time, approx two three hrs then try to re install...
But if your laptop is old then the problem could be because the fans working beneath get old and do not run upto the mark..usually they have two fans i believe...maybe one is conked?
This can be an overheat issue. Either the CPU or the Chipset is overheating. Make sure all your fans are working.
Laptops still turn on with the ac adapter plug in and without a battery plugged in. Nope a bad CMOS battery would give you a warning message on the laptop screen, stating the CMOS battery is low or needs to be replaced.
Also does your battery hold a charge? If so with the battery plug in only (without the ac adapter plugged in) does the laptop do the same thing?
Have your DVD Rom checked..I had a similar problem XP not loadin... It was because of compatibility of the rom... like wise it could be a mother board problem..
have it checked up by an acer service person
I am afraid that your problem is common to this laptop brand/model. A reason is that it uses AMD Turion64 with reported nominal operating temp at ~50.0?c. At ~55.0? the CPU fan will kick in until the temperature stabilizes which unfortunately takes a long time due to the nature of the enclosed spaces in a laptop.
Also lubrication will help improve the fan but will not solve the noise nor the turning on quickly, other than it's a complicated and tedious job opening the unit.
Other users of the same model reports positive results by lowering the supply voltage of your process. The process is called "undervolting" and best described in Mr. Dan Zhang's guide at http://www.laptoplogic.com/resources/guides/38/1/1/
and tried at http://forum.notebookreview.com/showthread.php?t=20249.
Hope that this give you an idea and pls post back how things turn up or if you need further information. Good luck and kind regards.