What is Firewall ?

Could you explain it to me please.

I am quite interested to know that  what kind of Firewalls people use in their computer and also the reason why they prefer that particular Firewall for their computer.

I have recently bought  a used scanner with 3 installation discs.

I installed it and it seems to be on my hard drive but when I click on the scanner icon, I get this error message, " THE SHELL 32.DLL FILE is linked to the missingexport SHLWAPI .DLL:SH REG US...

I am using Internet Explorer 7.0 on my Windows XP computer.

There are some files in my Temporary Internet Folder that I cannot delete at all. 

What' the problem look like?

Is there any way out to solve the problem ?

Every time I load a new Internet Explorer browser I get an msvbvm60.dll error .

Then it closes all other windows except the first one I opened.

Even the same error persists if I click on a link and a new browser opens and that one gets the same error.

My address book has been locked. When I try to send e-mail it tells me that the address book did not load.

When I go to start. all programs > accessories > address book it tells me that the address book has been locked by another application.

What could be possible...

Hi,

Whenever I click on my internet icon I get this script error "line 16 access denied" and internet does not appear . If I log off computer and log back on then it works. But few hours later it pops up with the same problem.

In recent days my internet explorer would close every time I clicked on a link or even while browsing.  

I don't understand, but I noticed that before that happened I could not get on the internet at all.

Internet explorer wouldn't even open.

I am connected to a broadband network.

It closes...

I use Microsoft Office 2003. I worked any file of my office. It send it another office they are open normally this file. But one day they are send me one file and I download it. and it was .docx format. I can not open it in my computer....

I used one pen drive. It is Trans-stack Pen drive and its memory is 4BG. I normally used every time. I bought it on two years. and used every time in full memory. But now I find 2GB. when i send some file over of 2GB then it was...

I am using Windows XP home and use outlook express for email purpose. I am facing a problem that I can send mail to anyone but unable to receive the emails. My computer is connected with LAN and it did not show any error messages to me regarding connectivity.

While...