I found that my computer has a TPM module to work with BitLocker but now I'm trying to see if it may reduce my system performance...
There's my spec:
Intel Core 2 Duo 3.0Ghz (VT-x)
2GB of DDR2-800 RAM (upgrading to 4GB soon)
160GB Western Digital 7200RPM
I want the best performance 'cause I'm a .NET and Web developper...