Easy Way to Lock a folder in windows XP without any software

Make a Folder in C drive rename it as "abc" without quotes.
Now open Command Prompt from Start Menu.
Type "attrib +s +h C:\abc" without quotes and press enter.
This command will Make your folder invisble and it can not be seen even in hidden files and folders
To make it visible again type "attrib -s -h C:\abc"
You can lock any other folder also by changing the location C:\abc to address of your folder.

How to boost PC Performance and how to search any file type or country time in google search

1.To boost performance of your PC or to increase RAM virtually

 Right click on My Computer Icon on Desktop 
>> Go to Properties 
>> Go to Advanced 
>> Go to Performance - Settings 
>> Go to Advanced 
>> Go to Virtual Memory - Change 
Keep the initial size same as recommended and maximum size double of it then restart your system. 
It will improve speed of windows and you can play some games which require higher RAM.

2.Google Search Related

1).FIND A FILE-TYPE WITH GOOGLE SEARCH

Searchword+filetype:pdf

Ex-internet+filetype:ppt

2).know time of any country

time:countryname

Ex-time:india