Replaced a crashed hard drive and reformatted it by mistake to 64 bit instead of 32 bit. Its an older pc with and AMd Athlon 3400 processor with 1 gig of ram. I know nothing about 64 bit operating systems. Should I reformat to 32 bit?
If it is running fast enough for you it should be fine. The only problems I have with 64bit OS's is printer drivers and older software. If you are only using the basics (office, internet, etc) you should be fine.
I didn't know there was anything on the hard drive format that signifies 32 bit vs. 64 bit???? The OS itself can be installed as 64 bit, but if your processor doesn't support it, the PC wouldn't be running at all. I think you are OK.