Hi ketan,
- You this excellent software
CCleaner[
^] to remove junks from your computer. It also removes unwanted registries.
- Use this software
Auslogics[
^] for defragmentation of Drives
- Run Anti-virus thoroughly to check for worms and do run specific softwares for
Spywares[
^] and
malwares[
^] as sometimes anti-virus may not detect them
- Uninstall unwanted softwares.
- Or formatting your lappy can also be considered after doing the backup of your system.