Stupid Mistake

I need some help with kind of a stupid mistake I did. I got a new CPU and in trying to OC it I had to reset my bios a few times. Well for some reason I set the date to 2007, as in not Dec 28-30, 2006 but 2007. I was getting some errors on the web and I finally figured it out. I changed it back but now the trouble is some files are dated 12-28 to 30-2007. One problem is Mp3's I have with those date's I can't edit the tags, I get a time date arror. Is there anyway to change the date on files to the correct date? I guess if it came to it I could change my system to one year ahead and work on the files, but I hope there is something else I can do.

You might want to give one of these programs a try...

SetFileDate (freeware)
http://no-nonsense-software.com/freeware/

Command line utilities:

Time Stamp 1.1 (can be set up so that you can right click on files and "Send To" TimeStamp)
http://www.pc-tools.net/win32/freeware/

Touch.exe (from the GNU utilities for Win32) at...
http://unxutils.sourceforge.net

WoW thanks a million...............

The program Setfiledate you listed was great. Easy to use and I got all the files changed back a year.