A lot of questions and i am not sure, if i can answer them… i will try:
1.) antivirus deactivated
2.) firewall deactivated
3.) achat worked fine a year ago (or two)
4.) achat worked a half year ago AFTER installation. starting again the other day it worked NOT. uninstall, install – it worked once (maybe cause the setup-routine was running achat)
5.) now my achat was too old. I removed it and tried to reinstall. I get 3 or 4 loading-pies… and then achat crashes without any error…
6.) drivers and os (=winxp) did not change.
