I had a friends lappy that I could not get MWB to load or run, but I was able to install it on a jump drive and the computer and run it from the jump drive. What I did was install MWB on a good computer update it, and then copy it to a jump/flash drive from the program files folder, and then install MWB on the infected computer and try running MWB from the infected machine, and when it tells you its missing the file, point it to the missing file it needs on the jump/flash drive. I did that, I had to run the scan few times, then I was able to get it to install run properly from the infected machine, I also had to do a repair install of xp because the virus had damaged the OS. Good luck, also look into the MWBs forums, those guys are good at helpping!