message with antivirus install that kb981889 is missing and to install

I unknowingly let my antivirus lapse for 1 week (i.e, no update happening). Had to uninstall and reinstall antivirus (Blink Professional with eeye digital security). During reinstallation, received message that said:

"KB981889 is not installed on this machine. PLease install this hotfix to resolve issues causing stuck network shares and RDP sessions as well as Windows kernel memory leaks."

I don't know what any of these things are, but I did check and found that kb981889 is not installed. Other things I read about hotfixes in general, though, said hotfixes are included in later updates and cautioned against using hotfixes. The PC does have all its updates. However, it has been running slow (which is why I discovered my out-of-date antivirus...I was checking things out) and not always finding in searches files that are in plain site. I've run utilities, defrag, scan disk. Things still aren't right.

Should I install this hotfix? Thank you!

Hotfix information
A supported hotfix is available from Microsoft.
However, this hotfix is intended to correct only the problem that is described in this article.
Apply this hotfix only to systems that are experiencing the problem described in this article.
This hotfix might receive additional testing.
Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

A Windows Filtering Platform (WFP) driver hotfix rollup package is available for Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2

* You will need to read the blurb & determine if YOU need to apply that hotfix.

* As a second opinion I suggest you run Malwarebytes...

Please download the free version of Malwarebytes.
Update it immediately.
Do a full system scan
Let us know the results at the end.

Malwarebytes : Download free malware, virus and spyware tools to get your computer back in shape!

* Would suggest you use Microsoft Security Essentials instead of what you currently use for AntiVirus.{ Must admit I am unaware of that program & a Google search is not particularly helpful}
Should you decide to follow this advice you must remove the existing AV software before installing MSE.

Microsoft Security Essentials - Free Antivirus for Windows

Thank you for giving more suggestions.

I installed and ran malwarebytes. It found 0 items. I'll run a full scan next. I know no one has heard of Blink ... they really don't shoot for the individual market. The support is lousy. But I haven't had an infection in 5 years. I used to have a major incident at least once a year prior and used all the big names, both paid and free. If you google eeye digital or blink professional, you'll find them. I'll let you know what I find on the full scan...would really like to figure out what has changed to make things slow down.



Scan type: Quick scan
Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM
Scan options disabled: P2P
Objects scanned: 193885
Time elapsed: 9 minute(s), 37 second(s)

Memory Processes Detected: 0
(No malicious items detected)

Memory Modules Detected: 0
(No malicious items detected)

Registry Keys Detected: 0
(No malicious items detected)

Registry Values Detected: 0
(No malicious items detected)

Registry Data Items Detected: 0
(No malicious items detected)

Folders Detected: 0
(No malicious items detected)

Files Detected: 0
(No malicious items detected)

(end)