Nicklas,
Do you have a National Instruments Software Entry within add/remove programs? Newer National Instruments software packages are now included within a single entry of add/remove programs entitled National Instruments Software. I would check to see if you have this entry within add/remove programs and see if NI-DAQ 7.0 can be uninstalled from there. The document linked below discusses this in more detail.
Cannot Find NI Software in the Add/Remove Programs Control Panel Applet to Uninstall It
http://digital.ni.com/public.nsf/websearch/8F58F4C92586986886256CE5005186F0?OpenDocument
If that doesn't work, then you might have something lingering in the Windows registry which you might have to manually delete yourself. It is usually a good pr
ocedure to uninstall all National Instruments software, clean the registry, and then start over and reinstall the software.
I have attached a word document that includes the steps for cleaning National Instruments software and starting with a clean machine. I have also attached a microsoft cleaning utility that the word document will reference.
I hope this helps.
Regards,
Todd D.
NI Applications Engineer