Good evening friends!

My PC volume disappears automatically.

After few minutes I start my computer my PC volume disappears & clicking the volume icon shows you don't have any sound card installed.

But I have my sound card installed.

I check for the recent driver for my motherboard & installed it but still problem persist.

I have been using Windows 2003 for two years, now I want to use Windows 7 in my computer simultaneously. But after installing Windows 2003 I can not Install windows 7 and vice versa.  How I can solve this kind of problem?

I want my computer will be trouble free computer for long time. 

How to keep up my computer from trouble free for long time. 

Please tell me which step should I take or I want a step by step solution for this problem.

I set up a password for my computer.

When I want to open my computer than the computer wants password But I have forgotten it.

In this situation I want to solve this problem .

How can I solve this problem ? 

My computer is running very well but when I want to convert anything, install software or remove software in my computer than the computer is going off.

What is the reason and how I can solve this problem?

I have a Laptop computer but the CD Rom is not good . But I want to install a fresh copy of windows XP. In this situation how can I install a fresh copy of windows XP in my Laptop computer.

Or how can I install windows XP without CD Rom?

A virus have blocked my system application REGEDIT. I tried to solve it by system restore but my bad luck. System restore was failed.

Is there any other way to activate the blocked REGEDIT without formatting the system? Please somebody help me .

I am using Windows 7 as my operating system. But it does not show run menu/ option. Without this my computer does not show some of feature of Windows. I have installed new operating system but still this problem occurs.

Please give me the solution.

My computer is too slow. I used FREE ANTIVIRUS to clean all the viruses and move all the viruses to vault but it makes no effect. It is still slow. I had add 1GB RAM also.

What should I do to make my computer fast?