how do I change my PC windows XP to windows 7? upgrading the former to the latter via internet? FYI, my PC config is as ff: hdd 40gb. ram 128mb. pentium4. pls advice me.
You don't do it via the Internet. You buy a CD and licence from a vendor. With only 128 Mb of RAM I wouldn't even think about it. I GB is normal for Windows 7 and are also going to need a bigger hard disk.
If you are looking for information as to how to download pirate software you have come to the wrong place.
Stuart