I recently purchased an Ispiron 1525 with Vista for my wife to use in her new business.  I set it up out of the box, installed McAfee anti-virus software, installed Quickbooks 2008, moved over her .pst file from Office on her old computer, hooked it into our WiFi network and connected it to a printer on my XP desktop.

Worked great for about 2 weeks and then began crashing.  Tech support suggested everything until we finally got to a full refortmat and reinstall.  Spent hours doing all of that and got back to the same place I describe above.  This was 3 days ago.  Last night it started crashing again.  Tech support suggests that it's software that is non-Vista compatible, but I've checked and it all is. 

Is there something in the old .pst file or connecting to the XP network that could be causing this problem?  Is there something else that could be the problem.  I've been up until 1:30am far too many times in the last month with this thing and I cannot take much more of this!