please try this:

A: uninstall SystemInfo (settings -> applicatins -> manage applications -> system info -> uninstall ), restart your phone, run dpkg with something else and see if the error message is gone

B: I have created two new binaries for you at https://projects.developer.nokia.com/SystemInfo/files. first install systeminfo_0.5.1_armel_A.deb, restart and see if the problem is gone. If that doesn't help, uninstall it and then install systeminfo_0.5.1_armel_B.deb from the same place and test again

If none of these work, then I suspect your problem is due to some database corruption in the package installer and not really related to SystemInfo.