Quicktime Codec turns out to be Trojan?!

[hopelesslover93]

Hi,

Last day my quicktime player said that i needed to download a new codec pack and so i did.And in a very idiotic way i downloaded it even though my antivirus warned me not to. But it turned out to be a trojan horse as my Kaspersky said,it detected 3 threats and sent them to the quarantine,and this trojan sent some worms to my private folders but they're all deleted by Kaspersky. Then i found the location of trojan folder and deleted that,also from recycle bin.Now there seems to be nothing wrong with my PC except for three evil files in my quarantine. Are those quarantined files still dangerous??Shouldn't I visit PayPal,eBay..etc?? I've already deleted QuickTime Player..