Thnx @thehuntergames i have finally managed to install the new wallet 0.9.0 and import the privkey.
First i asked google like you said and i found an old topic on this same forum How do you import old addresses into peerunity? so i found out that i have to use console but it wasn’t so easy because i didn’t knew i have to put the peercoin address between the " " signs otherwise it doesn’t accept the input. So i finally got a looong string key and wrote it on a notepad text file.
When i installed the new version wallet 0.9.0 it was still hanging to connecting forever so i assumed it was using old files/settings from the other wallet version.
So i (forced) uninstalled peercoin wallets with Revo Uninstaller to delete every registry key and every prefetch files left on Windows. Found 3 prefetch files on windows, and then i did a clean install of the new wallet version again, synced completely, and typed in console importprivkey “…” and it started to Rescan, and i got my money back on the wallet balance. So happy that i recovered my money, i thought everything is lost. 
And it says now i have 8 connections to Peercoin network so everything is ok now.
So the solving answer is like intergalactic said :
in the old wallet:
click on ‘debug window’
select the ‘console’ tab
type: dumpprivkey “peercoin address from wallet” (important to be between " ")
this will return the private key, you can copy it now to a notepad document.
Uninstall the old wallet using an uninstaller to wipe out everything related to wallet (registries,prefetch,etc) and then install the new version wallet.
in the new wallet:
click on ‘debug window’
select the ‘console’ tab
type importprivkey “yourveryveryveryverylongprivatekeystring”
wait 1-2 minutes to Rescan.
Done.
Now that i have recovered my money back i think i will keep the wallet installed and the PPC at least for a while. 
Edit : i wonder if dumprivkey “peercoin wallet address” can’t be used by anyone once they have your address to get privkeys,to steal your money ? Can be this a security major weakness ? Or its working only on the specific wallet to get a privkey with just a PPC address and not for the others too ?