Task manager won't open in Windows Vista

[milkreducespms]

hello, recently i have been having problems with my taskmanager. i have already read the thread on task manager problems have had no luck. basically the problem is when i try to open it in every way possible, cmd pops up for a second and then closes. when i type "taskmgr" in cmd it says "Process too big to fit in memory" the problem is i know there is no way it is too big to fit into the memory because i can run other bigger programs fine. ive scanned my computer with nod32, malaware bytes and spy bot s&d and all came clean. does anybody know a solution to this? thank you

btw i forgot to say i have windows home premium

 

[kimsland]

Start -> Run -> SFC /ScanNow (you will need your Windows CD, no Data will be lost)

Or have a look at: UPDATED 8-step Viruses/Spyware/Malware Preliminary Removal Instructions
Being the common issue on this type of fault