Perhaps this is a conflict issue with the built in Zip Folder handler in windows and WinRAR. Try these steps:
1) Uninstall WinRAR
2) Reboot
3) Run a Command Prompt as Administrator
4) Issue the following commands, one line after another:
Code:
regsvr32 /u %systemroot%\system32\zipfldr.dll
regsvr32 %systemroot%\system32\zipfldr.dll
cmd /c assoc .zip=CompressedFolder
5) Reboot
6) Reinstall WinRAR, and at the first run, run it as Administrator and go to its Options and choose your file associations as you wish.
7) Is problem resolved?
P.S. I still prefer 7-Zip over WinRAR!