If else usage for Windows Batch

@ECHO OFF
COLOR 3E
SET A111="Documents and Settings"
SET A222=Users
SET /P PC=Enter Computer IP or HostName: 

@echo Opening Remote Folder....
if exist "" "\\%PC%\C$\"%A111%" (start "" "\\%PC%\C$\"%A111%") else (start \\%PC%\C$\%A222%)
PAUSE

I made a batch file to open some remote folders but there is a mistake I didn't notice.

After entering IP; I want to open, If there is remote "Documents and Settings" folder. But If there is no "Documents and Settings", I want to see "Users" folder.

Where is the error I make?

Thank you in advance...

\_(ツ)_/ twitter.com/serdaruzun