I haven't patched anything.................... I have 1946, 4.09.
you see, because of how hard it is to actually make sense of what you're trying to say, is also why it's really hard to give you any kind of decent advice.
the above two sentences, for example, totally contradict each other...
if you have 4.09, then you must have patched the game....so why say you haven't patched anything, to just add to the confusion.
if you have the stock, pout-of-the-box game, it will be version 4.07m....
you need to patch it firstly to 4.08m.....
you then need to patch it to 4.09m.....
as crazyflak said, you need to test the game between each patch update to see if it still works.
sounds like you have done something wrong in the process, start over from scratch.
once your game is patched to 4.09m and working, make a backup copy of this entire working 4.09m version, and stash it somewhere safely for future use.
with your working 4.09m version, you are now ready to mod your game, either using a Modactivator, or a pack such as UP or HSFX....
follow instructions precisely for whichever mod version you want to install.
if you mess up during the process from here on, you can always try again using the backup version you made - ALWAYS HAVE A BACKUP COPY READY!
good luck!