I recently bought Dell Inspiron N5520 3rd generation core i5 Laptop but not satisfied with it's performance even my 3 years old dektop PC which is dual core performing better then this machine main problem occur after approx 2 months when I was browsing internet It got hanged I reinstalled OS but no it does not solved it I am using Windows 8 Release Preview while it was pre installed Linux Ubuntu It worked fine for 2 months with Windows 8 is there any hardware problem or driver as I have installed latest drivers from dell website and updated bios also
The problem occurring while online (ran fine prior to that, according to you), is suspect that your system incurred an infection of some kind. When you reinstalled the OS, did you format & repartition the drive ? That would normally take care of infections, but hackers these days are so sophisticated they can hide baddies on unused areas of the HDD. Take the time to run a full anti virus scan & other Malware scans.