I have had extreme lag issues, along with mouse not being responsive, and command prompt windows not being displayed. The recommended memory for the virtualization machine is 512 mb, and I don't want to slow down my whole machine, both Mac OS and Guest OS by increasing the recommended memory. Any info and help on how to solve this would be greatly appreciated. Here is my config. stats: Machine: Macbook Pro 2.5 ghz Intel Core Duo Memory of Machine: 4 gb Parallels: Version 3 Build 5638 Parallels Memory: 512 MB Parallels Video Memory: 16 MB Guest OS: Windows XP Professional Service Pack 3