Also, have a look at the reghacks listed in http://support.microsoft.com/kb/935649/en-us They have fixed similar issues for me in the past. ________________________________ From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Joe Shonk Sent: Wednesday, April 08, 2009 9:48 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Re: Windows was unable to load the registry A couple of things... Are you running UPHClean? If not, do so. How many users are logged into this machine and what's the turnover rate for a session? What OS are you running (2000, 2003 or 2008)? What kind of hardware are you using and how memory is in the box? Whats the average session memory usage? Joe From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Shankar, Shiva Sent: Wednesday, April 08, 2009 6:26 PM To: thin@xxxxxxxxxxxxx Subject: [THIN] Windows was unable to load the registry Hello, I'm getting bellow error message in my citrix server , how to resolve this issue. Most of our users getting this problem. When I checked in server memory & rights are good. Windows was unable to load the registry. This is often caused by insufficient memory or insufficient security rights. DETAIL - Insufficient system resources exist to complete the requested service. for C:\Documents and Settings\uvxd105\ntuser.dat For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Thanks & Regards, Shiva Shankar S