diff --git a/autoload/vundle/config.vim b/autoload/vundle/config.vim
index 96ff8bf..577a6aa 100644
--- a/autoload/vundle/config.vim
+++ b/autoload/vundle/config.vim
@@ -77,9 +77,9 @@ endf
 let s:bundle = {}
 
 func! s:bundle.path()
-  return join([g:bundle_dir, self.name], '/')
+  return expand(g:bundle_dir.'/'.self.name)
 endf
 
 func! s:bundle.rtpath()
-  return has_key(self, 'rtp') ? join([self.path(), self.rtp], '/') : self.path()
+  return has_key(self, 'rtp') ? expand(self.path().'/'.self.rtp) : self.path()
 endf
diff --git a/autoload/vundle/installer.vim b/autoload/vundle/installer.vim
index 6a225a2..3edbccf 100644
--- a/autoload/vundle/installer.vim
+++ b/autoload/vundle/installer.vim
@@ -70,6 +70,11 @@ func! s:sync(bang, bundle) abort
   if isdirectory(git_dir)
     if !(a:bang) | return 0 | endif
     let cmd = 'cd '.shellescape(a:bundle.path()).' && git pull'
+
+    if (has('win32') || has('win64'))
+      let cmd = substitute(cmd, '^cd ','cd /d ','')  " add /d switch to change drives
+      let cmd = '"'.cmd.'"'                          " enclose in quotes
+    endif
   else
     let cmd = 'git clone '.a:bundle.uri.' '.shellescape(a:bundle.path())
   endif