ssanthoshbalaji,
Try pressing F8 before Windows starts to load, then go into Safe mode. If this works, go to Control Panel, Add/Remove programs, locate all of the UMAX software in this list and uninstall ALL those components.
Try download the XP driver for your scanner from here:
ftp://210.58.98.5/SUPPORT/scanner/PC...5650Driver.exe
Also, I'm concerned that the NTLDR missing error could have been from a virus and NOT those drivers. I would check out:
http://www.techsupportforum.com/secu...this-log-help/
Post you message there and let someone walk you through a full scan of your PC just to rule out a virus.
- John