diff --git a/autojump b/autojump
index b4674ac..8274d4d 100755
--- a/autojump
+++ b/autojump
@@ -77,9 +77,9 @@ def unico(text):
 def save(path_dict, dic_file):
     """Save the database in an atomic way, and preserve
        a backup file."""
-    # If the dic_file exists, check that it belongs to us
+    # If the dic_file exists and os is not windows, check that it belongs to us
     # Otherwise, fail quietly
-    if (not os.path.exists(dic_file)) or os.getuid() == os.stat(dic_file)[4]:
+    if (not os.path.exists(dic_file)) or os.name == 'nt' or os.getuid() == os.stat(dic_file)[4]:
         temp = NamedTemporaryFile(dir=CONFIG_DIR, delete=False)
         for path,weight in sorted(path_dict.items(),key=itemgetter(1),reverse=True):
             # the db is stored in utf-8
@@ -88,7 +88,8 @@ def save(path_dict, dic_file):
         os.fsync(temp)
         temp.close()
         #cf. http://thunk.org/tytso/blog/2009/03/15/dont-fear-the-fsync/
-        os.rename(temp.name, dic_file)
+        import shutil
+        shutil.move(temp.name, dic_file)
         try: #backup file
             import time 
             if (not os.path.exists(dic_file+".bak") or
diff --git a/autojump.bash b/autojump.bash
index aad91a8..62e5c2f 100644
--- a/autojump.bash
+++ b/autojump.bash
@@ -19,10 +19,13 @@ _autojump()
 {
         local cur
         cur=${COMP_WORDS[*]:1}
+        comps=$(autojump --bash --completion $cur)
         while read i
         do
             COMPREPLY=("${COMPREPLY[@]}" "${i}")
-        done  < <(autojump --bash --completion $cur)
+        done <<EOF
+        $comps
+EOF
 }
 complete -F _autojump j
 
@@ -43,9 +46,12 @@ then
 fi
 
 export AUTOJUMP_HOME=${HOME}
-AUTOJUMP='{ [[ "$AUTOJUMP_HOME" == "$HOME" ]] && (autojump -a "$(pwd -P)"&)>/dev/null 2>>${AUTOJUMP_DATA_DIR}/.autojump_errors;} 2>/dev/null'
-if [[ ! $PROMPT_COMMAND =~ autojump ]]; then
-  export PROMPT_COMMAND="$AUTOJUMP ; ${PROMPT_COMMAND:-:}"
-fi 
+AUTOJUMP='{ [[ "$AUTOJUMP_HOME" == "$HOME" ]] && (autojump -a "$(pwd -P)"&)>/dev/null 2>>"${AUTOJUMP_DATA_DIR}/.autojump_errors";} 2>/dev/null'
+
+case $PROMPT_COMMAND in
+    *autojump*)    ;;
+    *)   export PROMPT_COMMAND="$AUTOJUMP ; ${PROMPT_COMMAND:-:}";;
+esac
+
 alias jumpstat="autojump --stat"
 function j { new_path="$(autojump $@)";if [ -n "$new_path" ]; then echo -e "\\033[31m${new_path}\\033[0m"; cd "$new_path";else false; fi }
diff --git a/install.sh b/install.sh
index f9a37ef..4ad8cb8 100755
--- a/install.sh
+++ b/install.sh
@@ -44,17 +44,17 @@ echo "Installing to ${prefix} ..."
 ./git-version.sh
 
 # INSTALL AUTOJUMP
-sudo mkdir -p ${prefix}/share/autojump/
-sudo mkdir -p ${prefix}/bin/
-sudo mkdir -p ${prefix}/share/man/man1/
-sudo cp icon.png ${prefix}/share/autojump/
-sudo cp jumpapplet ${prefix}/bin/
-sudo cp autojump ${prefix}/bin/
-sudo cp autojump.1 ${prefix}/share/man/man1/
+mkdir -p ${prefix}/share/autojump/
+mkdir -p ${prefix}/bin/
+mkdir -p ${prefix}/share/man/man1/
+cp icon.png ${prefix}/share/autojump/
+cp jumpapplet ${prefix}/bin/
+cp autojump ${prefix}/bin/
+cp autojump.1 ${prefix}/share/man/man1/
 
 if [ -d "/etc/profile.d" ]; then
-    sudo cp autojump.bash /etc/profile.d/
-    sudo cp autojump.sh /etc/profile.d/
+    cp autojump.bash /etc/profile.d/
+    cp autojump.sh /etc/profile.d/
 
     # Make sure that the code we just copied has been sourced.
     # check if .bashrc has sourced /etc/profile or /etc/profile.d/autojump.bash