How to remove ubuntu from system and use previously installed Windows XP/ Vista.
If you want to remove ubuntu then some people may ask “why not just delete Ubuntu partitions?”. No we can’t do like this because Ubuntu installs a boot loader called GRUB into the Master Boot Record (MBR), if you delete Ubuntu partitions all the data will be deleted but not GRUB! So when your restart your PC, GRUB will look for Ubuntu , when it does not find Ubuntu it show some error and you cannot even boot into windows. So here I’m going to show you two ways to safely remove Linux. First (Using MbrFix)
avast! Home Edition is a complete anti-virus package, that is is free for registered home non-commercial users. It contains an on-demand scanner with two interfaces (simple for novices and advanced for experienced users), an on-access scanner with Standard Shield (which protects against execution and opening malware programs) and an embedded e-mail scanner which scans incoming and outgoing email messages. Install Avast Antivirus in Ubuntu
First you need to download the .deb package from here