I have been running Version 7, Build 1.5, Rev 45786 for a couple of weeks and have had no crashes. My OS is Windows 7 Premium 64.
Have you tried any of the previous versions you can find here? Index of ./download/sprutcam/version-7/releaseandupdate/
Having various types of crashes can be difficult to trouble shoot, can you describe some of the crashes and any error messages or dialog box's that appear?
Hopefully some folks can post more in info on specific versions that are known to be more stable.
Frankly I have not had any crashes on any versions I have used since whatever the version was on the disk Tormach sent me this last early spring, sorry can't recall what that version was but it ran fine. I only had to update once for a version that had a bug but it never crashed or unexpectedly went to desktop. Live from SprutCam Russia had responded to that particular bug a while back here on the forum and had let us know that a newer version was available to down load that fixed the bug.
Sorry I can't help you more and I hope you get it figured out.