Partitions

Hello,
Last week on 26th April 2001 some of our PC were attacked by date virus which spoiled partitions. Can you advise me which utility to use to get at least data partitions. First partition is OS and others are data partitions.

In one other PC I have four partitions.
Partition 1 – Win98
Partition 2 – WinNT
Partition 3 – Data (NTFS)
Partition 3 – Data (NTFS)
When I try to boot to Win98 it work fine but I can not see any Data partitions. But when I try to boot to WinNT after selecting the OS option during boot process it give blue screen error. How can I boot to NT or atleast how can I recover my data partitions.
Thanks in advance.