I did a fresh install and put in SP 1 without trouble and every time i try downloading i get a 'has encountered a problem and needs to shut down' message from CMP.
What is the problem. Because I really want to get new locomotives..

Will CMP open to start with?
Does it then stay open if you don't ask it to do anything?

If this is the case I suggest you open CMP then go "Eat dinner/Walk the Dog/Do the washing up" (Delete as applicable), As it can crash like that while it is updating it's database, As 06's CMP is processor hungry it's best to just leave it alone for anything upto an hour.

Then you jmay find it more stable, The only other option that I know of is to reinstall it all again.

Hope this helps

HM

I just hit CMP or i download a engine and when i hit 'download list' off the DLS cart thing it pauses then gives me the 'needs to shut down message' without explanation and I cant do anything.

When you reopen CMP are there still items in your DL Helper window? If so leave CMP alone for a few minutes and then press the "Clear" button, Then close CMP, reboot and then reopen CMP again, Then leave CMP for half an hour and then try DLing something.
If it crashes again you need to reinstall TRS06

CMP wont open at all
I hit the DL button on DLS and it waits a second then i get the error message..
It does not open AT ALL

then you need to reinstall Trainz and I would redownload the service pack as well your DL might be corrupted