Solution:

It’s possible to speed up Windows Vista with a Flashdrive! ReadyBoost (a feature new to Windows Vista) uses a USB flash drive or a secure digital (SD) memory card as extra RAM! That’s right folks, if you have an extra flash drive laying around put it to good use and make it speed up your Windows Vista computer.

It’s as simple as connecting your flash storage to the USB port and AutoPlay will automatically ask whether to enable ReadyBoost. Just click Speed up my system (If this isn’t an option, Vista decided your flash drive  or USB port you connected it to wasn’t fast enough).  To use ReadyBoost, the device must support USB 2.0, be at least 256MB (with 64KB free) and less than 4GB for Windows Vista 32bit.

Here are the steps:

Connect your flash drive to the USB port and you will see:

Windows Vista will display the storage properties dialog box. Click Use this device, and select the amount of space you want to dedicate (more is better). Then, click OK.

If you take out the flash drive, ReadyBoost will be disabled. Your computer will be fine, though, because the files stored on the flash memory are only temporary copies.