I have got this info from a spanish site http://chgonzalez.blogspot.com/2006/11/instalar-vmware-server-en-fedora-core-6.html So the thanks to Christian González G.
You need to be root at first.
Then run this yum update
yum install kernel-devel xinetd gcc
now go to ntsysv and make sure that xinetd will start each time you start the server, and start it now.
Now get the VMware from here
wget [url from the site]
Register yourself and get the serial (It is free)
tar xvfz VMware-server-*.tar.gz
Now you need to do this.
It could be needed also to perform this operation.
cp /usr/src/kernels/2.6.18-1.2849.fc6-i686/include/config/i2o/config.h /usr/src/kernels/2.6.18-1.2849.fc6-i686/include/linux/
Be sure to replace 126.96.36.199-1.2849.fc6-i686 with your kernel version. Now go to the vmware direcotory and execute the install script.
Should be enough.