Reboot then try to reinstall.
Click Start > Run > type cmd > press Enter
In the black box type
ping pp-193-144.partypoker.com
Does it say 'request timed out' or something like this?
Reply from 93.191.193.144: bytes=32 time=84ms TTL=243
If the latter then your connection to Party is fine, it's their software that is borked.
I gave up on this last night when I started playing around 6pm but when I rebooted this morning I've managed to download PP and have just logged in so everything seems to be hunky-dory.
Thanks a lot for all the patience and assistance.