It doesn't make any difference. If you need to reinstall windows you just give MS a call when it rejects your internet activation of the os. They will reactivate it as many times as you want as long as you specifiy that it is only installed on one machine i.e., the puter you bought the OEM verfion for. Retail, you can install on any single computer. Say you buy an new machine...you can intall retail on that machine etc. So if you are a moron, tell MS that your OEM is installed on another machine....they'll now request you buy another OEM or retail OS....doh!
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.