Lenovo Ideapad Z560 booting problem

Sir,
I'm from Indore (MP) India.
I have a Lenovo Z560 series laptop purchased in Nov 2010 with config :
Intel i3,
3GB RAM,
500GB SATA Hard disk,
Logical partition-4,
512MB NVIDIA,
Windows 7 32-bit pre-installed Lisencee OS.

From the last week my Laptop not working normally. whenever, I powered on, it will starts with a random no. huge long beeps sometimes till the loading of files of OS typically 15-20 minutes always followed by the message "Windows Boot Manager" with selecting options select an operating system start windows repair start Windows 7 normally. When i select windows repair it takes about 15 mins & shows failure to repair select OS, when start normally also not boot automatically even though i have installed only win 7. when i select Win 7 it proceeds slowly.

Now, when i'm going to type amything in run tab / address bar / ms-word / ms-excel / naming a folder / open a existing doc a infinite sequence of "666666............" typed automatically in between also, control of touch pad got exhausted leads to unable to work .finally, shutdown the laptop manually.

I have already tried to restore in last known good config / safe mode booting / updation of antivirus and scanning in safe & normal mode........ still no results obtained.

Kindly suggest me how to get rid of this...?
Is it be a hardware or software failure or virus attack..?
what will be the easiest solution.......?

Plz...reply me urgently.....

With a lot of thanx in advance.....


ADISH JAIN