Guest OS (XP pro) running slow after upgrade to 5160 Product: Parallels Desktop for Mac 3.x Build number: 5160 Host OS: Mac OS X 10.4.x Tiger Guest OS/Remote OS: Windows XP Professional Guest OS amount of memory: 1500 mb Type of computer: MacBook Pro Computer RAM: 2 - 4GB Description: Hi Thanks for helping. I was able to run XP Pro on build 4560 perfectly. Now after upgrading to the 5160 build it runs w/ 1sec lag. I have tried fully uninstalling and reinstalling 4560 and then 5160. I also have fully uninstalled and reinstalled 5160. Throughout all of this my VM was completely shutdown. My cache is set to be optimized for virtual machine performance. My memory preference is set to "Enable Virtual Memory Preallocation" and I didn`t change the RAM amount after upgrading. The problem seams to start after I upgrade Parallel Tools in XP because before I installed the upgrade I tried a few speed tests and they ran perfectly. What do I need to do so that I can get my machine running normal, anybody know?