After switching from Debian Unstable to Kubuntu 8.10 I reinstalled my VMware Player 2.5.1 and started my Windows XP virtual machine. Soon I found that most of the keys near the numeric pad (del, home, right enter, etc) are either not working at all or doing wrong things. The obvious reason was some wrong keyboard mappings.
$ echo 'xkeymap.nokeycodeMap = true' > ~/.vmware/config
or if the config already exists
$ echo 'xkeymap.nokeycodeMap = true' >> ~/.vmware/config
More info here