win7操作系统下，rest不能运行

??? Error using ==> cd
Cannot CD to G:temp (Name is nonexistent or not a directory).

Error in ==> tempdir at 31
    curr_dir = cd(tmp_dir);

Error in ==> rest_misc at 119
 dirFCTemp  =dir(fullfile(tempdir, 'fc_*'));

Error in ==> rest>QuitAll at 393
 rest_misc( 'ClearTempFiles');

Error in ==> rest at 34
  QuitAll;
 
输入：rest以后出现这样的情况，请问有解决方案吗？

我的操作系统是win7 32位的，matlab 2009B