When started, the Malware Scan checks the installation for missing files. Sometimes malware can delete files if it is attacking Spybot. If there are missing files you are offered two options to recover these files. One is to use the Update to do a full integrity check and try to restore the files. The other is that the user is directed to our 'boot CD' creation page. The 'boot CD' allows you to do a 'clean boot' and scan the system. The second one is recommended if files are repeatedly going missing.
We recommend that you try to manually start the Update if you see this message. If it does not solve the problem and the message reappears, your system may be infected with software that is actively attacking your Spybot installation, in which case you should scan using the bootable CD.