Windows 7 is running slow on my friend's PC. Any good alternative?

[fatslob-:O]

Hiku said:

It's the 32-bit version of Win 7, and I believe it is a 32-bit CPU. Not sure.

Can't go back to XP because Microsoft no longer supports it with system updates, so it's infested with viruses and malware.
I'll check out Ubuntu 14.04 LTS. Thanks.

Common sense is the best form of antivirus, doing something stupid will get you viruses and malware even if you get Windows updates to patch up exploits ... 

Most people in developed countries use Windows 7 or above so unless you visit some sites located in developing countries like China your friend doesn't have anything to worry about when sooner or later Windows XP will get the fabled level of security that Macs do since hardly anyone will target it ...

Sidenote: The Pentium 4 is a 64-bit CPU ...