Prima metoda de rezolvare este descarcarea si instalarea ultimei versiuni de Framework

Daca instalarea unui nou framework nu rezolva problema putem rula ASP.NET IIS Registration Tool

• Navigam in (%WINDIR%Microsoft.NET<versiunea de framework>) si rulam comanda :

  aspnet_regiis.exe -i

• Daca aceasta comanda raporteaza o eroare citim log-ul erorii pentru a identifica problema. Exemplu:

  D:WINNTMicrosoft.NETFrameworkv2.0.50727>aspnet_regiis.exe -i
  Start installing ASP.NET (2.0.50727).
  .............
  Finished installing ASP.NET (2.0.50727).
  Setup has detected some errors during the operation.
  For details, please read the setup log file 
  D:DOCUME~1FWTLABBLOCALS~1TempASPNETSetup_00006.log

Daca nici unul din pasii anerori nu functioneaza putem incerca:

• Verificam registrii si stabilim daca au informatiile corecte privind unde se afla instalat aspnet_perf.dll:

  HKLMSYSTEMCurrentControlSetServices
  ASP.NET_2.0.50727PerformanceLibrary

• Indeplinim urmatorii pasi in CMD:

  net stop iisadmin /y

  net stop "remote registry"

  unlodctr ASP.NET_2.0.50727
  unlodctr ASP.NET_64_2.0.50727
  unlodctr ASP.NET

Dupa aceea din folderul v2.0.50727 rulam aceste comenzi din folderele Framework64 si Framework:

lodctr aspnet_perf.ini

lodctr aspnet_perf2.ini

Dam restart la IIS: net start iisadmin

Verificam urmatorul registru pentru a observa daca a aparut ceva nou

1. HKLMSYSTEMCurrentControlSetServices
   ASP.NET_2.0.50727Names

2. HKLMSYSTEMCurrentControlSetServices
   ASP.NET_64_2.0.50727Names

  Daca nici acum problema nu este remediata adaugam urmatoarele comenzi in CMD
atunci cand le rulam pe cele de mai sus:

unlodctr ".NETFramework" 
unlodctr ".NET CLR Data" 
unlodctr ".NET CLR Networking" 
regsvr32 /u C:WINNTMicrosoft.NETFrameworkv2.0.50727aspnet_perf.dll 
regsvr32 /u C:WINNTsystem32mscoree.dll
regsvr32 C:WINNTMicrosoft.NETFrameworkv2.0.50727aspnet_perf.dll 
regsvr32 C:WINNTsystem32mscoree.dll
  
   Din Dosarele Framework64 si Framework mai rulam in plus:

lodctr CORPerfMonSymbols.ini 
lodctr _dataperfcounters.ini 
lodctr _NetworkingPerfCounters.ini

Daca nici acum probleme cu dll-ul nu este rezolvata si avem instalat Microsoft Security Bulletin MS07-040 – Critical apelam la Microsoft Support