Hi ,
I have dual boot Windows Xp and Windows 7 .
If i install whole disk encrytion on windows xp , what will happen to my windows 7 partition ?
Install PGP on both BEFORE you encrypt and you should be fine:
https://pgp.custhelp.com/app/answers/detail/a_id/679/~/dual-boot-operating-system-compatibility-and-pgp-whole-disk-encryption
I think you're likely to get a BSOD when booting off the partition that doesn't have PGP on if you were to encrypt prior.