avast boot time scan for 64 bit

i am not able to start boot time scan as it say not supported for 64 bit versions,please do do something as i use indows xp 64bit or give me a solution for it. ??? ??? ??? ??? ??? ???

Boot scan does not work for 64bit yet, the plan is to have it in the avast 5.1 that is planned to be released later/late this year

or give me a solution for it.
why, do you have a virus you can not remove ? if so you can use a boot CD

Dr.Web rescue CD http://www.freedrweb.com/livecd/?lng=en
How does it work? http://www.freedrweb.com/livecd/how_it_works/?lng=en

we still need to wait on this one in the future avast will have this for us again i like the feature also