Problems during booting and there after...

Hi friends, i need some serious help here...

I have got an Acer Aspire 1600 series(1640 to be precise) laptop which i bought in 2006.
Till now, i didn't face any problem with this particular product, but now this laptop has made my life a hell of a place!!!!!
4 months back, the battery got damaged(i don't know how!). Since then, i have been using the laptop without any battery.
Everything was fine, when suddenly my OS crushed down. After that, problems started creeping in one after the other.

I would write down my problems point-wise for better understanding.

1. Two weeks back, my laptop started producing strange beep sounds during booting. I could not count the number of beeps coz they were quite heavy in quantity. The sound is still continuing to harass me till date.

2. Today, as i was doing some work, i restarted my laptop. After that nothing could be done. It might sound to be a bit strange, but it is true. When i click on the start button the start menu comes and then automatically vanishes. Similarly, when i right-click on the desktop to refresh, the menu comes and then automatically disappears. I cannot install any application as everything gets cancelled by itself. In fact, i tried to reinstall xp(sp2) (through a bootable installation disk), but it also got cancelled by itself. Even when i try to shutdown the system, the shutdown dialogue comes and then disappears.

Man, this is a really big problem and i am in a real emergency situation!!!

What should be done......that is the big question.....................

I really need some help and advice from you guys....

Hope to receive a quick and prompt reply....

Thank You.
Subhabrata Basu.