[Ham-Computers] Windows version question

[WA5CAB at cs.com]

How do you tell whether the version of XP you are running is 32 bit or 64 
bit?  I always assumed 32 bit but nothing on the machine thta I can find says 
one way or the other.  I tried to download a copy of the current Autocad 
DWG viewer, had to choose 32 or 64 bit, picked the former and can't get it to 
install.  It keeps claiming that .Net 4 is required and isn't installed (yet 
it is).

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480