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tdx.sys causing BSOD - Fixed!
Hopefully this post will help fix your issue.
I have Windows 7 installed on two laptops. One is a Dell Latitude D803 and the other a HP Compaq 6710b. Both would BSOD approximately every 5 minutes. 'TDX.SYS' was the culprit. After running WinDBG I noticed that it was a issue with my network adapter driver 'b57nd60a.sys'. Both laptops have the same network adapter (Broadcom NetLink Gigabit Ethernet) and both were crashing (x32 & x64 versions). I finally went to Broadcom's website and found drivers at the following links:
Broadcom Corporation - Download NetLink Drivers
or
Broadcom Corporation - Download NetLink Drivers
If one doesn't work they other will. Basically when 'TDX.SYS' causes a BSOD it is usually the result of a driver(s) (and some antivirus apps) that aren't fully compatible with Windows 7. You should run WinDBG and find out what driver is causing the error. It's not as hard as you think!
Microsoft's site for using WinDBG:
How to read the small memory dump files that Windows creates for debugging
P.S. Don't worry if you can't get the symbols to install properly. You should still see the file that is probably causing the error listed. If you Google the file(s) you will be on your way to fixing the issue.
Good Luck!