Exchange 2010 on a windows 2008 keeps rebooting on a Xen 5.5 host

this windows 2008 with Exch2010 is running fine for a number of weeks as a VM inside a Xen 5.5 host.

it started rebooting recently. It appeared related to some windows updates.

upon rebooting, the windows send error report to MS, and check solutions online.

finally it gives a clue about x64 bit cpu clock something, the windows are complaining about device drivers.

think ouside the box, there is another VM running on this host. the performance monitor indicates this XP-VM is using 100% CPU.  turning this 100%-cpu-usage XP-VM off helps the other server VM stay alive.

MSP managed service trial ... what a bad start ..or what a couple of bad start ...

yeah n-able vs kaseya .... I didn't do the actual trial. But I did see something in the test eviroment.

with n-able agent installed, one server's cpu usage shoot to 100%.

after an un-install failure of kaseya agent, another server totally stuffed.