error upgrade 7022 to 7.5

I install a fresh 7022, then i want upgrade my 7022 to 7.5.
as 100% i got a error "uninstallation completed".
i checked the updatemgrlog0.txt and find:

2008-12-23 21:57:08 [com.adventnet.servicedesk.updatemgr.util.SDPostProcessor] [信息] : testing....=Mon Oct 01 00:00:00 CST 2007 hdDate01 Oct 2007
2008-12-23 21:57:08 [com.adventnet.servicedesk.updatemgr.util.SDPostProcessor] [信息] : testing....=Tue Oct 02 00:00:00 CST 2007 hdDate02 Oct 2007
2008-12-23 21:57:08 [com.adventnet.servicedesk.updatemgr.util.SDPostProcessor] [信息] : Problem during installation of patch com.adventnet.persistence.DataAccessException: java.sql.SQLException: Conversion failed when converting datetime from character string.

i used sql server 2005.
thx for help.