I would recommend to leave Superfetch and Prefetch enabled. It will affect performance negatively if disabled. Superfetch is design to read from the HDD/SSD and write to RAM (memory) what it thinks you will need soon to make it available faster. It will not hurt the SSD at all since it is only reading from it.
If you used AHCI instead of IDE in your BIOS settings, then you should not have to worry about setting any of these settings in Windows 7 for your OCZ Vertex 2 SSD. For me, Windows 7 automatically set the settings in Windows 7 to what they should be for this SSD.
Hope this helps,