Invalid Handle Specified

>-----Original Message-----
>All of a sudden I'm receiving a message saying "Isass.exe
>System error. An invalid Handle was specified." Any
>ideas? Should I reinstall Windows XP? Thanks in advance
>for your help.
>.

Searched isass.exe in Google and followed one of the links
to the website of liutilities.
http://www.liutilities.com/

where they say this about isass.

*** ***
Process File: isass or isass.exe
Process Name: isass
Description: Added to the system as a result of variant of
the OPTIX PRO TROJAN which is opens TCP port 3410 and
allows a hacker to control an infected computer.
Company: N/A
System Process: No
Security Risk ( Virus/Trojan/Worm/Adware/Spyware ): Yes
Common Errors: N/A
*** ***

Virus checkers don't always find trojans. Try here:
http://www.trojanscan.com/trojanscan/scanner.htm

The following advice may help. It comes courtesy Kent W.
England, Microsoft MVP for Windows Security

*** ***
Trojans are stealthy and not always found by anti-virus
software. If you find suspicious processes running or task
manager or regedit is being killed after opening, you
might want to try one of the following tools to check for
trojans (after scanning with at least two anti-virus tools
to get rid of the easy stuff).

DiamondCS TDS-3 - Trojan Defence Suite (TDS), leading anti-
trojan system for Windows: http://tds.diamondcs.com.au/

Agnitum: Products: Tauscan: Home:
http://www.agnitum.com/products/tauscan/

Mischel Internet Security - TrojanHunterT: Finds and
removes trojans: http://www.misec.net/trojanhunter.jsp

MooSoft Development Presents The Cleaner:
http://www.moosoft.com/thecleaner/

Hacker Eliminator. - Advanced Hacker Protection:
http://hacker-eliminator.com/
*** ***

Once you get the computer back to normal follow ALL of the
advice here so it won't happen again.
http://www3.telus.net/dandemar/security.htm

Good luck.

Bill