HELP!! files in temp folder won't delete!!! think i might have a trojan? [View All]

[LeftPeopleFinishFirst]

A week I opened my mail (didn't open any attachments) and it said I had gotten a trojan. So I assumed antivirus took care of everything since it popped up. Now everytime I reboot my computer, my homepage changes to some advertisement site. I changed the homepage and rebooted again, but it still came up and changed my homepage. I went to my "Temporary Internet Folder" with the Content.IE5 folder, and deleted alllll my temp files. There were three in three seperate folders that would not delete. All contained the name "memberembedded" somewhere in their name. I would just delete them, or drag them to the recycle bin... but they won't delete. It also won't let me access the properties of them or anything like that. They seem to have no file extension. I think these are the root of my problem but I have no idea how to get rid of them. I ran norton on them, and i ran a trojan/spyware/worm detecter, as well as ad-aware and nothing picks them up. I don't know what to do. These people could have all my passwords right now and I wouldn't even know! heeeellllp.