PC very slow after installing windows 7?

Make sure your install came close to following the Best Practices for Win7 install as written in Clean Reinstall - Factory OEM Windows 7.

These include using the drivers provided by the installer, then quickly updated by optional Windows Updates, waiting until all Updates are finished before importing any drivers missing in Device manager from the Downloads webpage for the PC or device. This is not XP and drivers are handled differently in Win7 which is the first driver-complete OS.

If you're still experiencing slowness or hangs make sure you have the minimum hardware requirements met, then work through these Troubleshooting Steps for Windows 7

I installed the driver checking software so i can check which drivers i am missing.
I installed the nvidia and foxconn drivers from the website. There are still updates to be done. I'll do all these things and tell you if it improves.

Check drivers in Device Manager, not using a driver-finder program.

3GB thats unsual number for installed Ram. You have not said what version im assuming 32 Bit otherwise you would mention it.

The official figure from MS is GB Minimum but there figures are always on the tad conservative, its best to run it on the maximum it will utilize (32 Bit) so you probably have two slots replace the GB stick with a 2 GB its best to take the battery out first if its a Laptop. Before that try a def rag with defraggler including the option for def-ragging the page (swap) . Check all the drivers are there, and there are no conflicts in device manager.

It may be the graphics which are causing the overhead try switching the desktop to "classic view" it then looks much like a /windows XP desktop :)

Last but not least go Run/msconfig check all the non ms services and programs that are starting with windows disable any Google services.

If you go into "processes" in task manager you can see if there are any particular programs or services that are hogging your resources.

Iv'e installed 7 3 times now and it can be a bit unstable to begin with but for some reason settles down once its been configured correctly. any major changes be sure to restart rather than go in "sleep Mode" if the Defrag takes a long time leave it when you go out and set it to shut down when finished . You will need to temporarily change your power scheme to always on (except for the monitor display) Dont forget to put it back again.

I have 6 gb of ram and it is a 64-bit windows 7. I unchecked everything apart from my nod32 from the startup programs. I defragged disc C. I installed all the windows updates and drivers. My pc is still slow as hell. I am really desperate, don't know what more to do. I'll try to switch to classical view as you said.
My pc never gave problem with my old 32bit win xp. It was really fast. I hope it is the hardware so I can change something.

Have you done the hardware tests in Troubleshooting Steps for Windows 7?

If you'd report back results of the steps then we may have other ideas.