If it's the same dw20.exe as meant in http://support.microsoft.com/kb/841477, the same way of disabling it might work. Did you try?
1. It can be another program dw20.exe, for example malware. How many dw20.exe's do you have on your system? Where is it located?
2. it's far from sure that disabling the error reporting will prevent the error (that causes the tabs not to work) from occurring.
3. Does it happen also if you run IE in 'Safe Mode' (that is, without extensions and add-ons). If not, it's one of those that interferes. Could even be malware. If you can't find running IE without addons in your start menu (should be there somewhere) try iexplore -extoff from the command prompt).
Mostly I use Chrome as my browser, but for some internet radio (pandora) and for my wallpaper/screensaver program (webshots), Internet Explorer is explicitly preferred by the site. Lately, however, whenever I open a second tab in IE (in order to check out the lyrics to a song, or to download a photo from webshots), the dw20.exe screen appears, asking me if i want to Allow or Disallow it to run. I've clicked both. Nothing happens, the little window just keeps reappearing whenever I try to open a second tab in IE -- which it won't let me do. And that has made IE pretty much unusable even for radio (I can only listen to a station, but can't get further info on a song, which requires another tab) and, most painfully, for wallpaper and screensaver downloads -- I can't download any new photos, since that requires a second tab. The dw20.exe screen keeps appearing and won't let the second tab even open, much less load. I've looked for help online but all the help seems dated, referring to Window XP or Vista, but never to Windows 7. Anyone know how to rid me of this beast? Thanks.