GIJ,
I'll assume that you've already tried Instron itself and been turned away by either price or availability. I would imagine that either they or one of a number of NI Alliance Members would be happy to sell you some software.
Assuming the 4301 is fairly old, then you might want to search the
Info-LabVIEW Archives to see if anyone there can help. I took a quick look (searched for "Instron") and turned up
a bunch of hits, many of which had e-mail addresses you could try. Of course, you can always try to program it yourself if you've got a reference manual for the instrument.
As far as database connectivity goes, you can purchase the add-on toolkit from NI, which works great, or you can dig around on these forums for something called LabSQL, which I haven't tried. There are other potential solutions too, and some searching and reading on this site should help clarify the options.
Regards,
John