I started using Inventor 2011 recently and I'm experiencing the same problems. My Inventor is crashing very often, about once per hour.
I'm using Windows XP 32-bit.
I've got the same problem on another computer with the exact same specs. I've asked my collegues which are using Windows 7 64-bit and they say that their Inventor doesn't crash at all.
Previous versions of Inventor on my computer were rock solid, especially Inventor 2009.
I don't have any background programs running, I just use Inventor for work. So I think that it must be the 32-bit program that is unstable.
I'll post later with my computers hardware specs.
So I think that it must be the 32-bit program that is unstable.
I haven't noticed any particular difference on my 32-bit machine?
I did have more crashes after running 2010 and 2011 as needed. Then reformatted my HDD (probably had been 2 years since purchase) and all was well on re-install of 2011.
I'd be careful with the defragging these days:
I say this because, i was reading some of the gumpf that came with the Intel solid state hard drive, it specifically says do not defrag because it will decrease the life of the drive. You have to use the TRIM tools that come in the intel SSD toolbox.
OCZ drives may well be the same but using their respective tools