Hi All, I think my .net problems track back to a bad version of some .net components. My other PC's dont have the files (mscor* etc) with this particular version (21890) How can I uninstall these recent .net additions updates. They dont appear in the windows updates list (programs and features) and I dont know if another recently installed programm may have installed new ones. regards Justin.

Hi, Did you actually encounter any problem? mscor* must be existing on your other Windows 7 boxes. These kind of files belong to .NET framework component. If you did have any problem, just leave it alone. :)Juke Chou TechNet Community Support

Hi Juke, Yes, I am having problems running a lot of programs on my system that use the mscor files. I used a process monitor to see what was causing the crashes. Then sfc /scannow reported that it couldn't fix those same files as the source was corrupted (usually the hash was different). My other Windows 7 box has only earlier versions of some of those dll's even though it was up to date with patches (i think). One of the problems I have tracked down is with the 17755 ones. For example, A (problem machine) and B (stable) A) mscorwks.dll with versions 17514, 17587, 17648, 17755, 21963, 21768, & 21890. B) mscorwks.dll versions 17514, 17559, 17648, 21660, 21768. regards Justin.

Hi, Try this tool. http://support.microsoft.com/kb/947821 If it cannot fix problems, upload the logs to Skydrive. Juke Chou TechNet Community Support

Hi Juke, The log file is fairly short so here it is... Binary Version 6.1.7601.21645 Package Version 15.0 2012-08-13 21:31 Checking Windows Servicing Packages Checking Package Manifests and Catalogs Checking Package Watchlist Checking Component Watchlist Checking Packages Checking Component Store (f) CSI Payload File Missing 0x00000000 System.dll amd64_netfx-system_b03f5f7f11d50a3a_6.1.7601.17755_none_bf338757fdcc30a9 (f) CSI Payload File Missing 0x00000000 mscorjit.dll x86_netfx-mscorjit_dll_b03f5f7f11d50a3a_6.1.7601.17755_none_93bcefcfedcf4722 (f) CSI Manifest Missing 0x00000002 amd64_0d52f24b0491010bbcd788decd6ee91b_6595b64144ccf1df_1.0.7601.21977_none_4d5a136820160b16.manifest amd64_0d52f24b0491010bbcd788decd6ee91b_6595b64144ccf1df_1.0.7601.21977_none_4d5a136820160b16 (f) CSI Payload File Missing 0x00000000 mscordacwks.dll x86_netfx-mscordacwks_b03f5f7f11d50a3a_6.1.7601.17755_none_ff81bd3bc383baef (f) CSI Payload File Missing 0x00000000 PresentationCore.dll amd64_presentationcore_31bf3856ad364e35_6.1.7601.17755_none_0a2cdc14a6b35726 (f) CSI Payload File Missing 0x00000000 System.dll msil_system_b77a5c561934e089_6.1.7601.17755_none_aef01212189804d4 (f) CSI Payload File Missing 0x00000000 System.dll amd64_netfx-system_b03f5f7f11d50a3a_6.1.7601.21890_none_a86a53a8176f75e6 (f) CSI Payload File Missing 0x00000000 SOS.dll amd64_netfx-sos_dll_b03f5f7f11d50a3a_6.1.7601.21890_none_89d99a75bc9fb33b (f) CSI Payload File Missing 0x00000000 System.dll msil_system_b77a5c561934e089_6.1.7601.21890_none_9826de62323b4a11 (f) CSI Payload File Missing 0x00000000 System.Windows.Forms.dll msil_system.windows.forms_b77a5c561934e089_6.1.7601.21890_none_ee82eb3b19cd9c09 (f) CSI Payload File Missing 0x00000000 wpfgfx_v0300.dll x86_presentationcore_31bf3856ad364e35_6.1.7601.21890_none_ae679c3a079876cb (f) CSI Payload File Missing 0x00000000 System.AddIn.dll x86_netfx35linq-system.addin_31bf3856ad364e35_6.1.7601.21890_none_3b3913208f78178b (f) CSI Payload File Missing 0x00000000 WindowsBase.dll amd64_wpf-windowsbase_31bf3856ad364e35_6.1.7601.21890_none_b5c2326277c7be04 (f) CSI Payload File Missing 0x00000000 WindowsBase.dll msil_windowsbase_31bf3856ad364e35_6.1.7601.21890_none_9955746da747c505 (f) CSI Payload File Missing 0x00000000 System.Windows.Forms.dll amd64_netfx-system.windows.forms_b03f5f7f11d50a3a_6.1.7601.21890_none_6cac500e9500c2e2 (f) CSI Payload File Missing 0x00000000 WindowsBase.dll x86_wpf-windowsbase_31bf3856ad364e35_6.1.7601.21890_none_59a396debf6a4cce (f) CSI Payload File Missing 0x00000000 mscorjit.dll x86_netfx-mscorjit_dll_b03f5f7f11d50a3a_6.1.7601.21890_none_7cf3bc2007728c5f (f) CSI Payload File Missing 0x00000000 wpfgfx_v0300.dll amd64_presentationcore_31bf3856ad364e35_6.1.7601.21890_none_0a8637bdbff5e801 (f) CSI Payload File Missing 0x00000000 mscordacwks.dll x86_netfx-mscordacwks_b03f5f7f11d50a3a_6.1.7601.21890_none_e8b8898bdd27002c Summary: Seconds executed: 619 Found 19 errors CSI Manifest Missing Total count: 1 CSI Payload File Missing Total count: 18 Unavailable repair files: winsxs\manifests\amd64_0d52f24b0491010bbcd788decd6ee91b_6595b64144ccf1df_1.0.7601.21977_none_4d5a136820160b16.manifest

Hi, According to the log, you still have an unavailable repair file, please follow the guide below to fix it. http://technet.microsoft.com/en-us/library/ee619779(v=ws.10).aspxJuke Chou TechNet Community Support

Hi Juke, I am sorry that I didn't have time to try the solution. I needed the machine functioning in a hurry, so I did a complete reinstall. Thank you for the time you spent helping me. regards Justin.