Strange dllhost.exe behavior

Hi Folks, i am new to this site, i am using Windows 7 64bit Home, Core i5 M430 2.27Ghz, 4 GB RAM. Recently i have some problem with dllhost.exe. while playing Mp3s and Videos on KM Player, i switched to Media player. the comp uses almost 2 GB RAM and i have to dllhost.exe process running, It vanishes after a while, it eat up my memory and my comp crashes. Now everytime i click it freezes for a while, sometime i have to reboot, sometimes it will be normal.
Thanks in Advance

Run a scan of malwarebytes

I tried the malwarebytes, but it didn't detect anything..... should i run in safemode ? and the RAM is eating up

Better run it in safe mode. Also you may use Security Task Manager - Windows XP process viewer Security Task Manager and/or upload your file to virustotal.com. I hope your dllhost.exe is located in C:\Windows\System32? File Information - How to remove dllhost.exe error problem
Besides, it is known that dllhost.exe has problems due to COM+ Process How To Troubleshoot High CPU Utilization of an MTS or COM+ Process and sometimes to some buggy scripting used in IIS.

Now i have rundll32.exe and also dllhost.exe each that for a while and it disappeared. I have done Malware Scan as, i am using Kaspersky Internet Security... And the comp is slow and My memory is using almost 1.25 Gb outta 4 GB

So what am i supposed to do :| reinstall or can do anything to it ?