A post on a issue I once dealt with…
It causes blue screens of death or grey screen hangups + lots of PVS retries.
This got me busy for quite a long time, the fix applies to Citrix XenServer VM’s of version 5.0 and 5.5. (update xx)
In the case the VM gets it’s operating system streamed from Citrix Provisioning Server.
For anyone having these problems, try/test this fix or upgrade to a newer version of XenServer.
(I Know there are some people still having these problems…)