Laptop totally laggy and slow even after reinstall windows

Hello,
I have an issue woth my laptop. My problem is my computer has become very slow it would take a very long time to open an application. Some times the applications run by explorer would not open. Web pages take forever to load even windows explorer loads the folders very slowly. Lots of time the windows say "not responding"(incl. Chrome, FF etc.).
BUT that problems happens ocasionally. I mean laptop is doing fine for 5 minutes and that again lags etc. for like 5 minutes.
I can´t launch any game.
I reinstalled(with a format) the Windows for 3 times and problem still presists yet is was fine till 2 weeks ago.
Specs:
Hp Pavilion dv6940ec
Procesor Intel® Core™ 2 Duo T5750, 2 GHz,
RAM 3GB,
Windows 7, 32bit,
NVIDIA® GeForce™ 8400M GS
HDD 320 GB, 5400 rpm,
Even know that this laptop is made for W Vista, I used W7 for 2 years and it was running great.
Please help.
Thanks for response

Hi,
Shut down the notebook. Tap away at the esc key as you start the notebook to enter the Start-up Menu. Select the Bios option ( f10 ) and under the Advanced or Diagnostic tab you should find the facility to run tests on both the Hard Drive and Memory. Post back with the details of any error messages.
Regards,
DP-K
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****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
Microsoft MVP - Windows Experience

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