출처 : http://superuser.com/questions/47382/system-error-58-while-accessing-shares-on-windows-7-from-xp
System error 58 has occurred. 시스템 오류 58이(가) 생겼습니다.
HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\LargeSystemCache
...you need to tell Windows that you want to use the machine as a file server and that it should allocate resources accordingly. Set the following registry key to ‘1′:
and set the following registry key to ‘3′:
After changing the two registry settings, I simply restarted the "Server" service in Windows 7 and now the sharing is working fine.