First time XP user...Few questions

[houllier*]

Hi,

I got a new comp today and am using XP for first time, few questions

1 - I have MSN and Mirc installed, but no-where in the 'add/remove progs' section are they listed, how would I uninstall them?

2 - On the add/remove progs there are things called 'windows xp hotfix', about 10 of them with different numbers after them, Also their is a 'windows SR2.0' and 'WMP hotfix'... am not sure whether to get rid of them?

3 - It keeps telling me I need to install the service pack 2, but it also says 'back up your system'...Is it risky to install it then? Or should I just do it?

4 - It keeps showing the .dll files in program files folders... I have it set not to show hidden or system files but it still shows these, how do I turn these off?

4 - I try and rename some folders in program files but each time it says it can't do it cause another program is using the file etc etc...But I know it isn't, why is this?

5 - I keep on trying to delete moviemaker from a folder but it keeps on rturning to the folder when I close it, any idea why?

Thanks for help