 Neil Rubenking of PC Magazine successfully installed the beta version on 12 malware @-@ infected systems and commented on its small installation package ( about 7 MB , depending on the operating system ) and speedy installation . But the initial virus definition update took between 5 and 15 minutes , and the full installation occupied about 110 MB of disk space . Rubenking noted that the beta version sets Windows Update into fully automatic mode , although it can be turned off again through Windows Control Panel . Some full scans took more than an hour on infected systems ; a scan on a clean system took 35 minutes . An on @-@ demand scan test Rubenking conducted in June 2009 with the beta version found 89 percent of all malware samples : 30 percent of the commercial keyloggers , 67 percent of rootkits , but only half of the <unk> samples . The product 's real @-@ time protection found 83 percent of all malware and blocked the majority of it : 40 percent of the commercial keyloggers and 78 percent of the rootkits were found . 
