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File Version : 5.1.2600.2869 (xpsp_sp2_gdr.060316-1512)
Description : HTTP Protocol Stack
Copyright : Microsoft Corporation. All rights reserved.
Product Version : 5.1.2600.2869
Product Name : Microsoft Windows Operating System
Company Name : Microsoft Corporation
Internal Name : http.sys
File Size: 262784 byte(s) 256.640 KB
MD5 : cb77bb47e67e84deb17ba29632501730
SHA1: CE56AA6ED3EC8DA05727B367521A35A2694A08BC

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How to Install hpisa.sys
Repair Sys ProblemsFixing a corrupted or missing hpisa.sys error is an easy process with a few steps. Open the zip-file you downloaded.Extract the .sys file to a location on your computer. We recommend you to unzip the file to the directory of the program that is requesting the file.
If that doesn't work, you will have to extract the file to your system directory.
By default, this is C:/WINNT/system32/drivers (Windows NT/2000).
or C:/Windows/system32/drivers (Windows XP, Vista, 7).
Make sure overwrite any existing files (but make a backup copy of the original file)
That should be it. Although not necessary you can reboot your computer as well.