i updated the wallet but the connection alters from 0 connections to only 1 connection.
i have already checked firewall ans anti virus program.
how can it download the new blockchain if there is only 1 connection for about 20-30 seconds and then switches back to 0 connections all the time?
is there somewhere a list of peers which could be added into the peers file or something?

edit:
or is it possible that i'm still on the old blockchain with the new wallet?
it shows all the recent transactions from the old wallet in the middle window.
if this was the case, is there something like a bootstrap to download?

just for the info, i didn't deinstall the older wallet.
i just executed the new install file for the new version and run it.
should i have made a clean install including deleting the old wallet before?