Many thanks Blencogo for the suggestions.
As advised, I have now overcome the screen display problem.
But I still have the yellow question mark in device manager despite trying again installing the memory stick driver.
I downloaded the Memory Stick Driver (FS1_MemoryStick.zip) from vaio site for my model and extracted the ZIP file to C:\driver. They are:
1. tifmsony - security catalog file,
2. tifmsony - system file,
3. tifmsony - setup infomration file.
I also tried going to add/remove hardware and tried installing that way but could not as I don't know what type of hardware Memory Stick is and with what hardware should I associate it?
Any advice/suggestion are more than welcome.
Imtansar