I have ubuntu 10.04 and Windows 7 installed on my laptop. The windows 7 was working well for a few years and suddenly it started giving problem and became unbearably slow. i suspected virus and intalled Kaspersky antivirus. But no use as Kaspersky (after updating) could not detect a single virus. Hence I re-istalled Win 7 and the kaspersky again on the machine and just after a few hours it started giving problem and became terribly slow. Is the problem because of a virus or the Hard disk. On the other hand ubuntu was working fine till I re-installed Win7, but now I can't boot in ubuntu. I have valueble data on the disk. Also to mention, a few months back two of my external hard disks crashed (a 160 GB hard disk is not able to be detected) and (1 TB not able to open in windows or any machine except in ubuntu where it opens but the data cannot be retrived). Both these external (USB) disks crashed while I was using windows 7 (but then at that time Win 7 was working properly).
Is there any common reason behind the failure of these external and internal hard disks. More importantly, How can I solve this problem and retrieve my data as well. Your suggestions are much appreciated.