Is your PC is too slow.Here is a trick to use your Pen Drive as your RAM which can boost your PC's performance to some extend.Just follow these steps

>> The first step You need to do is insert a pen drive in the USB port (atleast 1GB)
>> After the pen drive is detected by your OS.Right click on My computer-->Properties

>>System Properties windows appears in that click the advanced tab -->performance settings-->Advanced-->change.
>>select the pen drive and click on the custom size radio button ,check the amount of space available
>>Enter the value in the initial and max column..

Just restart your PC and you are done.Your pc will be fast than before.The reason behind this is that you have used your pendrive space as a virtual memory.