Is your CUOM server integrated with ACS? If so, then you most likely have not granted access to the tasks found on this page to your current user. If so, then this most likely indicates a bad installation, and you are missing some vital entries in NMSROOT\MDC\etc\regdaemon.xml.
The best solution for the latter problem is to uninstall, then reinstall CUOM after setting your TEMP and TMP environment variables to something short like C:\TEMP.