I came to know about windows prefetch (.pf) when searching the windows Registry for some strange files which are created by Virus.
It seems these .pf files will be available at C:\windows\prefetch folder.
I wanted to delete some of these .pf files as I suspected some of them are affected by Virus.
Initially, I hesitated to delete them as I thought deleting these files will affect the normal running of Windows.
But, after searching the Internet I came to know that these files are just used as cache to improve performance for frequently used applications.
So I deleted these .pf files, and windows is running without any issue.
Some websites say that we need to delete these .pf files to improve the performance of the system. Some says that we should keep these files to improve performance. I am not sure which is correct.
If anyone knows more about this, you can share it here thro' comments.