Follow my guide and you'll be able to have as many instances of MSN open as you want.
First off all you need to enter Regedit (Hit start, type "regedit" and press enter)
Then choose:
HKEY_LOCAL_MACHINE
SOFTWARE
MICROSOFT
WINDOWS LIVE
MESSENGER
Then right click and choose "new" "DWORD Value" (32bit for 32bit windows and 64 bit for 64 bit windows)
Name the new DWORD Value:
MultipleInstances
Now right click on "multipleinstances" and choose "modify"
Change the value data to "1" and make sure "hexadecimal" is ticked
Now close RegEdit and your done.
You can log into as many MSN accounts as you wish at the same time off the same PC
