HI-TECH Software has released a series of patch level updates which add support for 64-bit Windows Vista. Additionally, some other minor updates were made as well, such as bug fixes and support for new chips.
For more details:
PICC and PICC-Lite v9.60PL2
PICC-18 STD v9.51PL1
HI-TECH for dsPIC/PIC24 v9.60PL2