I installed MOZY FREE Backup software on my computer by following their instructions.
After installation, my computer kept freezing and then I got the Windows Blue Screen of Death!
Basically, MOZY FREE Backup CRASHED my computer.  I could not even do a system restore. I had to restore my computer from scratch.  I am still in the PROCESS of putting back all my programs and FILES, this is very time consuming.

Furthermore, after I BACKED up my files, I could not retrieve them using another computer. It kept telling me that I had to register and install MOZY Backup, it just would not retrieve my previous registration.
I am still not able to retrieve my files.  Luckily, I kept local BACKUPS on some DVD's. MOZY may be free, but there is always a catch.  Please be aware Mozy free backup could crash your computer?
 Maybe that's how they get you; then they tell you have to purchase one of their plans???
FYI:  I have 2GB of RAM and a 2.0 GHz AMD processor and it still CRASHED it!Well i DLoaded and installed on both an XP and a Vista machine and i couldn't reproduce your RESULTS...
It's possible you have other issues with that machine.