I am getting this message when I log on,<BR>explorer.exe application error<BR>The instruction at "0x7fca1fa" referenced memory at "0x000000005". The memory could not be written. Click on OK to ...

This issue usually occurs if the explorer.exe system file has become corrupted or some process interferes with its smooth functioning. You could try the following suggestions to resolve the problem: ...

When I was researching your problem I Googled with the first line of your error:<BR><BR>"Explorer caused an invalid page fault in module EXPLORER.EXE at 017f:00401f31"<BR><BR>Got loadsa hits.