Windows 7 Problem HELP

Hey people I just bought this computer about 3 months ago and it started to have some problems... I don't know what's wrong with my computer system.

A brief description of the problem:
-Can't open Windows Media Player, Microsoft Office 2010 Powerpoint, Notepad, Command Prompt, Windows Task Manager, and some bugs with Mozilla Firefox ETC.

-For most of the programs, I double clicked on them but it could not be opened. It just pop up for a second and dissapears immediately.

-For Windows Media Player, It shows this: server execution failed.

-For Mozilla Firefox, there is this problem, sometimes when I go to a page it will have continuous pop-ups saying: "Would you like to quit or save and quit" BUT I could not click on the buttons to close the tabs it just hanged... and when I try to restart my computer to open it again, it's the same so I uninstalled it twice and the same thing HAPPENS... D';

-I've tried to open those programs with the "open as administrator" option, but only the command prompt and notepad works others does not...

What's wrong with my computer? HELP! ;l

Thanks,
sharmcxm

maybe a virus. do you have any av software installed?

scrooge

Yea I have an antivirus, free program Avira. There are 3 trojans in my com...

Erm there is this suspicious file that I don't know what it is in my documents. The file name is Track_01.exe
It's definately not one of my files. Is it a virus? I've scanned it but the anti virus program says it isn't...

Maguscreed said:

try this real quick and tell me what the result was.
SFC /SCANNOW Command - System File Checker

It says Windows resource protection did not find any integrity violations

try downloading and run Malwarebytes antivirus and see if that helps.
sorry i don't have the link handy for you but theres a free version you can get.

scrooge

Yea I've performed a scan it says NO MALICIOUS THREATS.... OMG... so what's the problem -___-

Try System Restore to a point before the problems began - keep working backward.

If necessary run it from System Recovery Options.

Uninstall Avira and install MS Security Essentials or Avast 5 to use with the Windows Firewall kept updated.

Update the new AV and run a Full Scan.