Computer started to lag

[enterman1]

Computer suddenly started to lag

Hello there.So about 30 mins later my comp started lagging.I was playing on steam offline mode(internet issues[provider had a break in last night and lost servers]) on mount and blade warband and right after i exit a town i am slapped with this wave of lag and buzzing noises from my speakers.I tried restarting and clean upping but till now no results.And the problem is that when I look to task manager it says that i only use 30% of the CPU and 1.80 GB of ram out of 4 GB(when on mount and blade).And all the games are like this but when i close them everything runs smooth again.
specs:
CPU: intel i5-3470 Quad core 3.20 GHz
Graphics :Nvidia GeForce GTX 650
ram: 4 GB
windows: 7 ultimate
l also i got a windows controller plugged inside if that helps.
I unplugged the controller ill write if anything changes

 

[enterman1]

nothing changed.Ill do a virus scan and then if nothing changes ill just reinstall the windows.
Is there anyone that can help?
To be more precise any kind of sound i try to play comes with some low bup noises like an echo or something and its VERY annoying.

 

[andrew129260]

Have you tried a system restore point before you noticed these issues?

Has anything in your system changed recently?

Video drivers up to date?

More info please.

 

[rvcjew]

list your specs in your profile too please so we know what they are.

 

[gregrocker]

Go over your install thoroughly with Troubleshooting Steps for Windows 7