Illustrator CS6 Freezes/Hangs on SaveAs

Question

When I open a dwg file in illustrator or another AI file that I've exported from Rhino & try to 'Save As' in Illustrator, the application freezes and I have to kill it via task manager.
This problem started mysteriously about a week ago.  I've spent countless hours troubleshooting & also tried a fresh install, but no dice.   Please help!
INFO:
I'm running Windows 7 64-bit & an NVIDIA Quadro 4000 graphics card.
I pulled the following info from Event Viewer (let me know if I need to be providing other information & where I can get it):
The program Illustrator.exe version 16.0.3.691 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Action Center control panel.
Process ID: 13e0
Start Time: 01d0602838a2d856
Termination Time: 31
Application Path: C:\Program Files\Adobe\Adobe Illustrator CS6 (64 Bit)\Support Files\Contents\Windows\Illustrator.exe
Report Id: f22793f4-cc1c-11e4-9da2-3085a999af16
System
Provider
[ Name]
Application Hang
EventID
1002
[ Qualifiers]
0
Level
2
Task
101
Keywords
0x80000000000000
TimeCreated
[ SystemTime]
2015-03-16T20:42:32.000000000Z
EventRecordID
87069
Channel
Application
Computer
Joansie-PC
Security
EventData
Illustrator.exe
16.0.3.691
13e0
01d0602838a2d856
31
C:\Program Files\Adobe\Adobe Illustrator CS6 (64 Bit)\Support Files\Contents\Windows\Illustrator.exe
f22793f4-cc1c-11e4-9da2-3085a999af16
55006E006B006E006F0077006E0000000000
Binary data:
In Words
0000: 006E0055 006E006B 0077006F 0000006E
0008: 0000 
In Bytes
0000: 55 00 6E 00 6B 00 6E 00 U.n.k.n.
0008: 6F 00 77 00 6E 00 00 00 o.w.n...
0010: 00 00 ..

Answer 1

Hi guys,
Ok - fingers crossed, but the problem seems to be solved.
It was very strange bc when I opened up AI from scratch, drew a bunch of random shapes & tried to Save As, it worked fine.  However, when I opened any file where the vectors did not originate from AI & tried to Save As, AI froze -- the AI save dialogue would not pop up after I input the file name and selected file destination (in the explorer save window).
In another forum entry (Re: Illiustrator CS6 crashes when creating New File)  someone suggested changing the default printer, so I tried that & oddly enough it worked!  Some of the printers my computer is hooked up to are networked & some aren't - I just switched my default to a non-networked printer.
If someone from Adobe could please explain what Saving a new file has to do with computer printer defaults, it would be really great to understand & might shed light on other similar issues..  thanks!!