Thanks for your help.
My HDD is 500GB. In "My Computer", it's showing the full capacity. But there are no virtual drives on either 'My Computer' or Disk Management.
Sorry I could not take a Screenshot, but In the Disk Management, It shows something like this:
SYSTEM Simple Basic NTFS Healthy(System, Active, Primary Partition) 199MB 165MB 83% No 0%
Simple Basic NTFS Healthy(Boot, Page File, Crash Dump, Primary Partition) 427.37GB 208.83GB 49% No 0%
I created 2 VHDs for 150GB (100GB+50GB).....I really want to get my drives back....