I did as you said. I mean Microsoft update. I have updated with Office update, windows update, Norton Antivirus 2007 installed and full laptop scanned with nothing harmful found. Also I have installed Ad aware, Spybot, Windows Defender. All scanned my laptop and no threat found.

That's good idea but can you please tell me how can I integrate that extra 1 gig of ram in mu laptop.

I kept my PC open for 12 hours as I said and nothing happened!
I shut down for 1 hour and opened few minutes back and while I was browsing, it got stuck!
I took off the wire which is power plug, so on laptop it wasn't showing that it's running on battery now.
Whatever I do, nothing happens until I keep pressing the switch off button

Please help me...

Thank you,
AbdulBasit Makrani

If you press ctrl+alt+del when it is not frozen, what are the processes running on your system?
Go to the 'Processes' tab and make the task manager box quite big then do a print-screen of what it shows. Also to make it easier for us, could you press the column marked 'CPU' and arrange it so the most memory draining applications are shown at the top ~ the largest percentage. Please have nothing else running on your system apart from the task manager.

If you need that I can provide you but what I did now is removed Windows Vista Home Basic now and installed Windows Vista Ultimate SP1 32 Bit Edition and till now it's working smoothly and no freezing.

But I faced 1 problem which is when I open Windows Media Player, click File, Open, Computer and then my laptop gets crashes and shows blue screen with something written to prevent your computer something message... and 3-4 seconds that blue screen is there and laptop gets restarted!

I did this twice to see if that was by mistake or something but it happened again at the same time when I repeated the same thing.

Can you please help me in this regard? I hope this is much easier that the freezing matter.

Thanks a lot everyone who took my issue seriously and tried to help me and took out your precious time for me

Warm Regards,
AbdulBasit Makrani

If you can take a note of the BSOD (blue screen of death) message, take a picture would be the easiest option in your case. Home Basic is not the best version of Vista in my opinion, so well done for moving upwards! Also as caperjack said earlier, i would recommend getting some more RAM for you laptop; check out this link to find out what your Laptop supports:
http://www.crucial.com/systemscanner...aspx?Agree=Yes
Download the scanner and run it from your desktop and the crucial website will tell you what RAM your laptop supports, and if you like you can buy them from crucials website or take their information and use it elsewhere.

Thanks brother

I am unable to get screenshot as it happens too fast and only screentshot can be taken from mobile.

Also I don't want to repeat this action again to make my laptop in more trouble

I scanned my laptop and the result says:-

We're sorry.
Crucial currently does not have any compatible upgrades available for your particular system.

* Maximum Memory Capacity: 4194304 MB
* Currently Installed Memory: 1024 MB
* Available Memory Slots: N.A.
* Number of Banks: 2
* Dual Channel Support: N.A.
* CPU Manufacturer: GenuineIntel
* CPU Family: Intel(R) Core(TM) Duo CPU T2450 @ 2.00GHz Model 14, Stepping 12
* CPU Speed: 800 MHz

What does the above scanned result means?
How can I upgrade to 2 GB ram? Will I need to open laptop for that or any external ram is available in market?

maybe its running so slow because your power management software is underclocking it

So what you want me to do ?
Any suggestions?

I meant take a picture with a camera A BSOD is just a way of your computer telling you something is wrong and then it shuts down your system. If you could get the code that would look like "0x000..." if you can get that line code, your problem can be diagnosed.