Can I install on Latitude D620 WIN7 64-bit or 32-bit?
No - that's a 32-bit processor. Only the Core 2 Duo processors have EM64T support.
If the processor is a Core 2 Duo, you can use 64-bit. If it's a Core Duo, Core Solo or Celeron, 32-bit only.
It's Intel Core Duo processor, ID: 06E8, 1.83GHz, Cache 2048KB.
Thx, but is it a good idea to install WIN7 32-bit on D620 or better XP?
BTW It has 2GB RAM.
Your call. Within a couple of years, XP will be history as far as security updates. If you've plans to use the system beyond 2014, Win 7 is the way to go. Otherwise, it's your call.
THX a lot, I'll install WIN7.