Original Title: Improving system performance.HiIs it safe to delete dllcache and prefetch files from c:\windows for improving system performance in windows XP/Vista/Win-7. if no how can i avoid the "RUNNING OUT OF MEMORY" Error messages, please help.thanks in advance Krupesh N

No, you don't want to delete the dllcache and deleting Prefetch will not help either. In fact, deleting the contents of Prefetch may slow your computer down even more. While "out of memory" type errors can be RAM-related (hardware), this is rare. In most cases it is because you have too many programs/processes running in the background. The most common cause of this is malware infection. Here are general troubleshooting steps for a slow computer. Start with #2 and thoroughly scan for malware.Some reasons for computer slowness:1. Computer hasn't been maintained - http://www.elephantboycomputers.com/page2.html#Maintenance 2. Computer is infected with malware - http://www.elephantboycomputers.com/page2.html#Removing_Malware 3. Hard drive is too full. Remove unnecessary stuff, uninstall unused programs. Don't forget to back up!http://www.elephantboycomputers.com/page2.html#Backing_Up4. Flaky third-party software. Toolbars and add-ons are particular culprits in this area. Uninstall toolbars (Google, Yahoo, ISP-branded, etc.) and look carefully at what add-ons are in use in your browser(s).5. Computer has too many unnecessary programs/processes running in the background. Manage your Startup:For XP - How to Troubleshoot By Using the Msconfig Utility in Windows XP - http://support.microsoft.com/?id=310560 The free Autoruns program is very useful for managing your Startup - http://www.microsoft.com/technet/sysinternals/default.mspx http://aumha.org/a/loads.htm - What loads at Startup?http://www.theeldergeek.com/services_guide.htmhttp://www.blackviper.com 6. User is running a bloated/invasive antivirus program such as ones from Norton and McAfee. Replace with a better program. I recommend either NOD32 (commercial) or Avast (free). Avira is also good but the free version has an unpleasant nag screen (Google for instructions as to how to disable this). User may also be running more than one real-time antivirus/firewall/security program.7. User has installed new programs that are processor and/or memory-intensive (Photoshop, AutoCAD, Mathmatica or the like) and doesn't have the necessary hardware power.8. Hard drive is failing and is in PIO Mode (IDE drives only - not applicable to SATA drives). This is very dramatically slow (like being back in 1985). See Hans-Georg Michna's information here -http://winhlp.com/?q=node/10 If the PIO registry fix doesn't "stick" (or you have a SATA drive), the hard drive is probably failing and should be tested.http://www.elephantboycomputers.com/page2.html#Hardware_TshootIn addition to the above, also see http://miekiemoes.blogspot.com/2008/02/help-my-computer-is-slow.html MS-MVP - Elephant Boy Computers - Don't Panic!

Hi Krupesh ,Addiing to Malkeleah’s suggestions, you may see these links.Preventing low memory problemsWays to improve your computer's performanceHope the information helps. Please post back and let us know.RegardsDebleena SMicrosoft Answers Support EngineerVisit our Microsoft Answers Feedback Forum and let us know what you think.