I want use an alternative PDF reader to adobe reader. Is it possible to another PDF reader

When I want to reset or up date my computer BIOS it should be reboot. What can I do?

 I want to know about on line banking. Is it always safe? Please help

 I want to see how much video ram or memory my video card has? Please help.

Is it the cause’s problems of any hard drive to format it several times?

Any help is greatly appreciated

Some times my computer suddenly freezes the it completely halt. How can I get a solution for it?

Some times windows tell me that your virtual memory is too low, how I can see the windows virtual memory?

My computer is affected by virus. To protect it from virus, I have installed AVG Anti-virus, but after I install it, the computer's performance is too slow.

Please help.

 My CD ROM drive is one year old now suddenly it can not perform. What can I do?

Yesterday morning when start my computer I sow that my computer has no sound. Please help.