Do u want to speed up ur system ?

It can be done with the help of usb drive as follows:
1. Plug in the usb drive into ur system
2.Right click the usb drive and click on the ready boost
3.click on use this device 
click on apply and ok............
------->This may use some of the space of the usb drive for speeding up the system and that space may not be available for storage.............however the extent of speeding up the system depends upon upon the usb drive.Infact , the usb drive behave as if it is a external RAM