The problem is that Synaptics "palm check" is not your problem. Palm check detects that your hand is resting on the touch pad, and will not intemperate that as an attempt to move the mouse.
The problem is a setting in windows 8 that disables tapping while typing. However the correct driver should automatically disable this, and use palm check only.
Make certain that your driver is in fact up to date. Make sure you get the latest driver from the manufacturer that is intended for your laptop and for Windows 8. If no driver is offered for Win 8 try the Win 7 driver, or the generic driver from http://www.synaptics.com/resources/drivers. Be sure to fully remove your driver before installing another version. If there is no Win 8 OEM driver for your device, and none of the others work either, then you can try disabling the setting manually:
Unfortunately I can not seem to find the location of the setting! It's easily accessed in 8.1:
Open the charms menu, select settings > "Change PC Settings" > "PC and Devices" > "Mouse & Touchpad" and disable the taps delay.
But I can not locate the same setting (which may have a different name) in normal Windows 8.
If the setting is grayed out (or otherwise impossible to change) then you may need to remove your drivers, disable the setting, then re install them.
If it still doesn't work, then I am afraid you will need to contact your laptops manufacturer for assistance. They may release a new driver in the future, or it may not be possible to fix. In the second case, there may be third party software that can help you.
At least that's how I got it to work when I had a similar problem. Though soon after fixing it a new version of the driver was released that not only would have fixed it, but made it work even better. YMMV
1Can you go back to the old drivers ? – harrymc – 2013-09-16T18:51:33.793
i can go back to the old drivers but that effects scrolling and other features. – Gil Birman – 2013-09-17T06:48:40.780
Do you have the OEM supplied drivers designed for your specific system, and for Windows 8? – zeel – 2013-09-17T14:29:07.073
@zeel there are no OEM drivers for windows 8 – Gil Birman – 2013-09-17T18:05:50.610
Then it may be impossible to fix at this point. Touch-pads are finicky, each one is customized for a specific laptop, thus generic drivers will not always work properly, and drivers intended for other OS versions will not always work properly. You should contact your manufacturer and see if they plan to release a driver. If not, then you may want to look for third party software. – zeel – 2013-09-17T21:55:50.887