Ted,
If you are at all Ok with manual drawing software, a program I used professionally in the old days (1990, early 2000s) was Lotus FreeLance (part of the old Lotus Office Suite. Don't know if it's still available. IBM bought Lotus to get Notes, but also bought the suite. I have a legacy version that I love and still use for drawing, but it is quite manual. It runs fine on Vista. I'm installing Windows 10 now, and haven't tried that yet. May need to run in XP Compatibility mode, which is fine for what I need.
I have also used Visio and Excel, too. Excel is similar to PowerPoint, but the structure and tool layout is different and without some of the flexibility that PowerPoint offers. Neither PowerPoint nor Excel give me the flexibility that I have with FreeLance. By the way, you can get the equivalent of Office Professional capability for free with OpenOffice. Check out <www.openoffice.org>. When I went to my Mac several years ago, I started using OpenOffice. There is a version for Windows and a Version for Linux. The command structure is slightly different, so there is a slight learning curve, but is is completely compatible with Word, Excel, PowerPoint and Access. No Outlook, but who cares? And did I mention, free?!
Hope this is useful.
Jim
Peg and Jim Healy aboard Sanctuary, currently at Charlotte Harbor, Punta Gorda, FL
http://gilwellbear.wordpress.com
Monk 36 Hull #132
MMSI #367042570
AGLCA #3767
MTOA #3436