Help with zip files

I have recently uninstalled winrar and now I have a problem. Every time I try to open a zip file I get a box that pops up saying it is unable to find winrar.exe and it asks for another program to use. I am running Win XP and it has support for opening zip files without useing any other program. How do I get this feature back. I have contacted the maker of winrar and they said once winrar is uninstalled everything should be back to normal. WRONG!
Microsoft has not returned any of my 20+ emails and I have pretty much given up hope on them (I know, big suprise right?).
If anyone can help I would greatly appreciate it.
Thanks,
Kevin
Microsoft has not returned any of my 20+ emails and I have pretty much given up hope on them (I know, big suprise right?).
If anyone can help I would greatly appreciate it.
Thanks,
Kevin