Last week I visited my wife's office to check her comp which was infected with some virus/trojans. I installed AVG, CCleaner, Registry Cleaner, Diskeeper, etc to weed out unnecessary elements. I noticed that the defrag was going too slow, and had to abort the process. I thought may be the comp had become slower or an HDD problem. I told her to back up the data. So when I visited it again 4 days back, I installed HD Sentinel to check the HDD. It showed everything is ok, 100% fine.
But yesterday my wife called me and told me that the entire 'D' partition where the data was stored has disappeared. And when the hardware guy came today to check, even the C drive has disappeared. Also, the partitions are not visible when it is connected to another computer as a data drive.
I now feel quite bad for not following up more strictly on the backup
Any help? The data on 'D' that was critical was around 7gb only. How much it might cost to retrieve it? Thanks!
But yesterday my wife called me and told me that the entire 'D' partition where the data was stored has disappeared. And when the hardware guy came today to check, even the C drive has disappeared. Also, the partitions are not visible when it is connected to another computer as a data drive.
I now feel quite bad for not following up more strictly on the backup

Any help? The data on 'D' that was critical was around 7gb only. How much it might cost to retrieve it? Thanks!