Can this app run in Windows 7 O/S

if you are a Windows 7 user, you can get WhatsApp working with very minor limitations. Another issue is the app itself. Compared to similar solutions like Viber or Telegram, it is a very basic app and lacks many features offered by competing apps in their Desktop versions. These competing apps do not require the mobile version to be running on your phone. In case of Viber or Telegram, your phone is required only for a 1-time SMS verification. Other than these issues, WhatsApp runs fine.

Whatsapp is a chat program for phone, but here they offer a program for your PC:
On your own risk.
wat is het landen nummer? WhatsApp for PC Download Windows 7 8 Computer without Bluestacks

get android driver for windows

You can run the Windows XP mode, and run apps under Windows XP mode. Probably your device is not 100 percent compatible with Windows 7, and or it does not have a proper drivers (and the device manufacturer does not provide Windows 7 drivers).

Click on the following link:
http://www.microsoft.com/en-us/download/details.aspx?id=20
Download this app from Microsoft and run the App to see if your computer is compatible.

if you are looking for a faster windows boot and operation your best bet would be to upgrade your harddrive to SSD(Solid state drive) super fast, windows boots in a matter of seconds...

but give this site a read...

http://howto.cnet.com/8301-11310_39-57363586-285/how-to-start-windows-7-faster/

success

Hello

OK, please be more specific on the exact question or problem you are experiencing.

Kind regards
Andrea

That depends on which vesrion of windows 7 you have ?

The basic versions of windows 7 do not generally alow every program to be run that was designed for an earlier version of windows.

HOWEVER
I have found no problems running any application at all so far even if it was intended for an earlier version of windows.

The home premium version of win 7 is the lowest and may on rare occasion cough and spluter when running XP/vista apps.

In my tests sometimes the installation does fail but windows 7 then takes over and asks if I want to re-install using corrected setting.

If I let it do that then the installation has always worked.

Hi,
Yes, Windows 7 should run OK on your PC

Move your ram into different slots, put different ram in slot 2 or 3, sounds like bad ram, 32 bit apps access ram VERY diferently that 64 bit apps.