Windows Vista Wont Boot?

I have a microsoft windows vista 32 bit home premium. I changed some system files to make my pc look like a mac and it said they were for windows 7, I didn't listen and changed my files. When I rebooted the computer didn't boot. Startup Repair wasn't working and safe mode wasn't too. I finally got my vista cd and booted from the cd. I ran startup repair a couple of times and it fixed it but not the whole thing. Now startup repair doesn't work because it says that to remove any mobile music player or any driver plugged in, I removed all plugs except the monitor, mouse, and keyboard, but still the same thing. I opened cmd and tried sfc /scannow and chkdsk but it didn't work. I ran windows memory test but it said i have no problems. I tried to see if speedypc would work but it didn't work on ubuntu live cd or windows xp live cd, it said files are missing please reinstall. System Restore says there are no restores to restore your pc. And last known good configuration doesn't work too. Are there any live cd programs that fix curropted files and dlls?