Modified Permissions As A Result Of Virus.

I was recently victim to a malware attack on my computer, quite a few nasty rogues. Included ave.exe, irz.exe, Ikydua.exe, Ikydub.exe, Ikyduc.exe, Ikydud.exe, and many many more. They would launch whenver I tried to open any application that the viruses thought could be used against them. Anyways, I finally reclaimed control of my computer and quarantined and deleted all of the bad exes and registry keys. However, my permissions are still messed up from the attack. For example, I can no longer open regedit or merge .reg files.

Also, I believe the attack originated from somebody using an IP sniffer on an internet forum and specifically targeting my IP. I talked to some friends who's IPs were also compromised, and they said that they were attacked at around the same time. So, is there any way I can change my external IP to avoid future attacks? I'm hooked up via a cable modem.