I used KRD newest version from internet download from Kaspersky to make an antivirus scan of a double boot Win 7 on a SSD. After finishing, mbr and partition table are destroyed ! Mbr can be recovered one of the systems of win 7 works, but the first is destroyed by defects in partition table which cannot be repaired because it is severe and unstable ! Thank you Kaspersky ! Moderator: Moved to the correct forum

Hello. 1) How did you understand that the problem in the MBR? What manifestations of the problem now? Please attach screenshot. 2) Did you see a mounting volumes error (https://support.kaspersky.com/14239) in problem KRD launch? If yes, what did you press? 3) Did you have malware detects in problem KRD launch? You can see Report and Quarantine (https://support.kaspersky.com/14224). 4) Please provide hardware report (https://support.kaspersky.com/14234) and traces (https://support.kaspersky.com/14223).

Problem solved. Reason possible not fully correct quick clone of an original system to SSD with 90% capacity used. Some MBR problems before, repaired. After KRD now defect MBR and PT. Repair by testdisk using PT backup from original, and then using some backups of 2 partitions. Ev. KRD checked inconsistent but so far working PT and MBR and had some effects, who knows ! Conclusion: Clone of complicated original with 7 partitions and 90% used capacity better not a smart clone but a sector by sector with verification, e.g. by macrium reflect or acronis. But KRD had a negative effect ! No viruses found !