No Installation CD came with Sony vaio!

gregrocker said:

You can always clean reinstall using the Product Key on the COA sticker to get a leaner, superior install without the factory crapware and utlities which have better versions built into Win7: Clean Reinstall steps

Win7 Home Premium x64 SP1 English Official ISO download
Windows 7 USB-DVD Download Tool

But I would still try making your Recov Disks first so you have a path back to the factory install if needed, or save a Win7 backup image as it exists now which is the modern way to reimage your HD or its replacement in minutes: Backup Complete Computer - Create an Image Backup

Dear gregrocker,
Hi! Thanks a lot for the practical advise. You are appropriately REPPED:)!

Try this link for further information in recovering the factory installed Windows 7 OS from your recovery partition.

How to Recover Factory Settings on Sony Vaio Computer with Windows 7

You have mentioned that there is no recovery partition on your hard disk. Can you post a image of your disk management showing partitions?

marsmimar said:

Your Vaio should have 3 buttons just above the keyboard on the top right. They should be labeled Assist, Web, and Vaio. If you have the Assist button: with the computer turned off, click the Assist button once and that should automatically start the computer and open the Sony/Vaio Recovery Wizard. From there you can follow the prompts to access the hidden recovery partition, make recovery disks, perform troubleshooting steps, etc.

Dear marsmimar,
Thank you and will do! You deserve a rep.