I have an antivirus problem! please help!

Hi,

recently i noticed that avg doesnt apear on my icon tray thingey, and avg wasnt on, when i opend it, it still didnt leave the icon there, and it hadnt done a virus scan allready for a few days and i didnt even notice (i thought that its still working but i guess not). so i tried to uninstall it, and then install it again (i downloaded the newest version of it), but then when the install was complete it said: Error: action failed for file avgamsvr.exe... no such file or directory.
and i dont know whats the problem. i also tried to install AntiVir and the files that didnt succeed in the installetion were:
basic/avgnt.exe
basic/avguard.exe
basic/guardgui.exe
basic/sched.exe
basic/update.exe

currently im not using any antivirus cuz it just wont install it for me! please help!!
thankyou