Hi Leonitas,
Thank you for posting on the National Instruments discussion forums.
I have installed LabVIEW 7.0 on a test machine and attempted to install the NI-IMAQ 2.5 drivers, but these don't appear to be compatible with LabVIEW 7.0, so this may be the issue. I did find that the NI-IMAQ 2.6 drivers are compatible with LabVIEW 7.0, so I would suggest you install these. They are available to download here:
http://joule.ni.com/nidu/cds/view/p/id/766/lang/enPlease give these a try and post a reply if they do not resolve the issue. Thanks.
Rishee B.
Applications Engineer
National Instruments