conection problem via ad hoc

Hello ....

I have a problem i just started to search around internet how to fix ...but no results. I have a PC wich has onit windows 7 conected to internet with dinamyc ip....ewrything works fine..til here :). So last week i conected into the USB port an USB 1.8 802.11g Wireless LAN Adapter to create an ad hoc to be able also for my wife browse the internet trough my PC. Evrything worked fne i created the ad hoc after i added the Whireles adapter etc etc ... when the adding close asked me if i allow other to be able to nav. the internet and share file i clicked yes and all worked. So the problem it is now...frist we had a storm and electricity falled and i had to reinstal my pc coz got bugged and after reinstaling the same win 7 i can not manage to make share the LAN adapter for my wifes laptop, wich before worked. Now she cant acces the adapter. I can add the adapter but when is finned the next next clicking on ad hoc it does not asks me any more if i whant to share the internet ... (i have to tell you that all components are working 100% thay where tested )Also another issue i have problems to password the ad hoc . onlt unsecured version i can make without pass--same was before . And onlist is WEP wich always says that pasword i would create to short etc etc .... Personal type securise does not exzist onlist. Ty 4 enybody whom helps me....

Have you try deleting and recreate the adhoc connection?