Blocking FPS on Vista

[Spencer]

Hello,
A few days now since my fps (frame per second) in games are blocked at a value between 30 ~ 36 fps whatever adjustments videos games are played.

I am under Vista with the following configuration:
Intel Core 2 Duo E8400
Geforce 9800GTX
4 GB DDR2

Everything was going well so far, I measure my FPS with the software FRAP and I exceeded almost all the time on the 100 FPS games that I played. And now it no longer exceeds the 30 or so.

I've uninstalled and reinstalled my video driver, but it changes nothing.

I checked the active processes running in the background, nothing abnormal.

Someone would have an idea of what has happened to my computer?

Thank you in advance for your help

[nitesh mehta]

Is this happening on the same game or some newly installed games?
You recently upgraded the driver for the video card?

[Spencer]

yes it is the same games (Oblivion, Half Life 2, Medieval Total War 2)

And no, I have not changed my graphics driver.

[newtech]

The vertical sync may be activated? in this case, it blocks your FPS which has a fixed value ...