i guess i can use xampp portable server or other alternatives, or run Qemu on cd..

It shouldn't be too hard to make a tiny Linux live CD with configured LAMP and installed b2evolution website.

Although running something off the CD in windoze is beyond my mind :)

you can use a live cd runing apache + php + mysql
For example:
http://lamppix.tinowagner.com/
http://slampp.abangadek.com/info/

More choice here: http://www.livecdlist.com/purpose/server

Thank you. I have just installed [url=http://www.chsoftware.net/en/mowes/mowesportable/main.htm]mowes portable server [/url]package of wamp, it works just fine