local $,="\t";
while (<DATA>) {
	/Windows\s(\w+)\W+Version\s((?:\d+\.?)+)/ && print $1,$2,"\n";
}
#Outputs 
# 98	  4.10.1998	
# 2000	5.00.2195	
# 95	  4.00.1111	
# NT	  3.51	
# NT	  4.0	
__DATA__
Windows 98 [Version 4.10.1998]
Microsoft Windows 2000 [Version 5.00.2195]
Microsoft Windows 95. [Version 4.00.1111]
Windows NT Version 3.51
Windows NT Version 4.0