Right now, Microsoft have their BETA Antispyware to download for free. Then when its' tweak, tuned and have found all the bugs which will have been reported by users, they will come out with an official version.
Internet Explorer 5.5 was at a time in a beta stage. As a matter of fact Windows 95 which came out in version A, B, C, to Windows 98 and finally Windows 98SE (second edition) were more or less betas leading to Windows 98SE which should have been an actual Windows 95 that didn't come right on time.
Asus P4P800 SE
Intel P4 3.2 Gig 1024 Meg PC3200 cas latency 2.5
RAID 0 2-36.7 Gig SATA WD 10,000 RPM
200 Gig WD ATI ALL-IN-WONDER 9600XT
6500 Kb bandwith Internet Connection