Help...with updating Video Drivers

Hi all....when I update my Forceware Video Drivers from Nvidea should I be physically going into my system Folder and removing the older Driver versions prior to installing the new one?

I haven't done that yet and have updated to newer Beta Drivers a couple of times now.
By deleting the older versions I take it that this would not allow me to "Roll Back" to previous versions?

Also, does thier tend to be "conflicts" by not deleting the older Drivers?

Thanks for any responses...

PS I'm running an Evga 6800 Gt GPU Overclocked 401 Mhz / 1.1 Ghz
My system:
Intel P4 3.2e Gig
MOB is a Gigabyte P4 Titan Series / Intel 865PE Chip set
1024 MB PC 3200 DDR 400 RAM (2x512 MB)
Enermax Dual Fan 460 W PS
2 Additonal small Cooling Fans
200 Gig 7200 Hard Drive (2 seperate Drives - running my Paging File on idle Drive)
EVGA GeForce 6800 GT GPU (not overclocked and stock cooling)
17" BenQ LCD Monitor


B

I don't see why old drivers should be uninstalled first. Some others uninstall them, I don't know why.