Why after installing win 7 64-cue PC began to lag?

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Hi all.
Iron:
Intel Pentuim G620
RAM 4GB
The video card is not an individual.

Computer was heavily infested with various programs stood OS win 7 32 cue. PC flying (the performance index was at 5.9). Demolished Windu, cleaned everything, put win 7 64-the cue ball and PC net has become just to slow down when opening chrome. Productivity began to write 1.0 (due to the graphics and gaming graphics). What's the matter? The processor is weak and does not pull 64-the cue ball?
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5 Answers

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The video card drivers install.
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Drivers for video are not installed or not up or curve/the wrong drivers. Maybe not enough for some drivers. Maybe in chrome on/off accelerated rendering through the graphics card.
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Productivity began to write 1.0 (due to the graphics and gaming graphics).

This contains a hint what kind of drivers are missing. In the absence of the drivers for the video card, Windows uses the built-in VGA driver (who only knows how to put the pixels in the memory in order to display the picture, neither of which fast rendering is not the question).
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I had to leave OS 32-bit and it to roll fix128 rutrekere to 4-128 GB of RAM instead of 2.75...3.5 GB was determined (would be 36 bits via PAE).
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Has sense to put 64-bit version of any OS if you have less than 8 GB of RAM, well, driver download)
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