i got a new AM3+ ATX mobo coming, my last mobo was an am3+ microatx should i reinstall windows? or should i just uninstall the old drivers and install the new ones
Just install your missing drivers. You should be fine. The only time you need to really worry is if you are switching from AMD to Intel and trying to keep the same install of Windows. It can be a bit more tricky then.
What version of Windows you have? Is it OEM or retail?
If its OEM? that copy of windows is tied to that motherboard only. If retail? yes you can use that copy of windows in the new MOBO considering that old MOBO will not be use anymore.