Elementary, My dear Dr Watson

It's late, but I GOTTA share this.
I've recently put a few new video making programs on my computer. I've also installed some neat photo editing software programs. Somewhere along the line, I messed up, and it caused a very bad problem.
After I take pictures, I remove the sd card from the camera, and place it in an "egg" ( a usb card reader). It's been so much easier to just copy and paste the pics/vids, than to go thru the tedious process of connecting the camera to the computer, and dealign with upload software.

Anyways, for the last 2 days, whenever I've tried to copy and paste data from the sd card, my computer jams. Then I get the "Dr Watson's debugger has found a problem" (or something like that). I can view pictures and videos that are already on the computer, but cannot upload new from the sd card.

THEN, I noticed that after opening ANY folder on the computer (that contained avi files), I would get an error that said:
Installation at 0x03c415b referrenced memory at 0x00000000, and it could not be read.
Like Im supposed to knwo what the hell that means. I ran registry checkers, and startup managers, and nothing helped.

FINALLY, I came across a webpage that offered a working solution (so far) .

The solution was:
Run regedit and find the following key :- HKEY_CLASSES_ROOT\SystemFileAssociations\.avi\shellex\PropertyHandler
Delete the "Default" value then close.
You should now be able to see .avi previews almost instantly but without the crashes

So far, so good (although only about 15 minutes of opening and closing various folders.

Boring shit for anyone whose system is running perfect, but invaluable info for anyone having the same problem I was. Transfering pics and vids of the kids is 75 % of what I have a computer for. (for the nosey, the other 15% is porn and the remaining is for making music cds and reading about other peoples lives thru blogs). Ohh, and let's NOT forget about Ebay!