I am now consistently getting the error message in the screenshot below every time I try to launch my Windows XP Guest OS on my MacPro [OS 10.5.4; 2x3GHz Dual-Core Intel Xeon with 16GB 667MHz DDR2 RAM]: I have of course enabled 'virtual memory preallocation' as suggested, but it doesn't fix the problem...Here are two screenshots showing my current VM Memory Settings, as well as Parallels' general application memory settings: I've been running both a Windows Vista and Windows XP Guest OS on my Mac for over a year, and only just in the last couple days did this error message begin appearing and it now appears when I try to launch either OS... I have not been able to resolve this issue at all, and it's completely preventing me from being able to access either of my VMs whatsoever!! PLEASE HELP! Any suggestions would be greatly appreciated... Thanks!
Supported memory on VM is 1500 MB , also make sure that you have at least on Mac disk at least 2* VM memory MB free
It still doesn't work, even with my adjusted settings according to your response (see below)... Any ideas?