Updating to VMWare Workstation 6.5 seems to fix this problem for Debian Lenny.
Debian Lenny (fully updated: 25.09.2008) VMWare Workstation 6.5.0 build-118166 NVidia proprietary drivers (173.14.09-5+2.6.26.5) 2.6.26.5 custom-built Kernel Guest OS - Windows XP Pro SP3 (with VMWare Tools)
Updating to VMWare Workstation 6.5 seems to fix this problem for Debian Lenny.
Debian Lenny (fully updated: 25.09.2008) 09-5+2. 6.26.5)
VMWare Workstation 6.5.0 build-118166
NVidia proprietary drivers (173.14.
2.6.26.5 custom-built Kernel
Guest OS - Windows XP Pro SP3 (with VMWare Tools)