Firstly, if only 2 months old is it under warranty, and if so is there any free support you can get there - if you've paid for a warranty/support why not use it!
Secondly, there could be a conflict with Norton and other software installed since.
If you are happy to download new software and confident to try setting things up yourself, try these free down loads:
Advanced Windows Care - general system maintenance
Ccleaner - cleans all the unwanted C**p off your system
Startup Inspector - settings to load only the programs you need at start up