not a valid Win32 application

[rburrhead]

When I download a program an click to install it a box pops up saying the download I am trying to install is not a valid Win32 application. This is a new problem. I have not had any problems downloading in the past. I am running WXP SP3. This even happens when i download updates for programs i am already running.

MY PC INFO:
=============
Software
========
Operating system
----------------
Windows XP Home Edition (5.01.2600 Service Pack 3)
User privileges
---------------
Administrator
System
======
Motherboard
-----------
SiS-650GX
BIOS
----
)Phoenix - Award WorkstationBIOS v6.00PG
CPU
---
Intel(R) Pentium(R) 4 CPU 2.66GHz 2656 MHz
Memory
------
512 MB (Bank0/1)
512 MB (Bank2/3)
Video card
----------
SiS 650/651/740/661FX/741/760 series
Sound card
----------
Unimodem Full-Duplex Audio Device
Drive configuration
===================
SiS PCI IDE Controller
----------------------
Driver: Silicon Integrated System 5.1.2600.5512
Primary IDE Channel
-------------------
Driver: (Standard IDE ATA/ATAPI controllers) 5.1.2600.5512
+ WDC WD1600AAJB-00J3A0 (Master / UDMA Mode 6 / 149 GB)
Secondary IDE Channel
---------------------
Driver: (Standard IDE ATA/ATAPI controllers) 5.1.2600.5512
+ JLMS XJ-HD166S (Master / UDMA Mode 2 / 0 MB)
+ HL-DT-ST DVDRAM GSA-4040B (Slave / UDMA Mode 2 / 0 MB)
SiS 7001 PCI to USB Open Host Controller
----------------------------------------
Driver: Silicon Integrated Systems 5.1.2600.5512
SiS 7001 PCI to USB Open Host Controller
----------------------------------------
Driver: Silicon Integrated Systems 5.1.2600.5512
SiS PCI to USB Enhanced Host Controller
---------------------------------------
Driver: Silicon Integrated Systems 5.1.2600.0
AJLJ5TT6 IDE Controller
-----------------------
Driver: (Standard mass storage controllers) (Standard mass storage controllers)
+ DUXA RCL2RS5Y SCSI CdRom Device (0 MB)
+ DUXA RCL2RS5Y SCSI CdRom Device (0 MB)
+ DUXA RCL2RS5Y SCSI CdRom Device (0 MB)
VIA OHCI Compliant IEEE 1394 Host Controller
--------------------------------------------
Driver: VIA 5.1.2535.0

McAfee antivirus
Spybot

Any Help is appreciated, thanks

 

[floppybootstomp]

What you downloading then? A few examples please.

 

[rburrhead]

What you downloading then? A few examples please.

here are a few examples of updates I downloaded from Piriform.com all are .exe downloads
ccleaner OK Dload & install
speccy OK Dload & install
defraggler OK Dload NO install
recuva OK Dload NO install
------------------------------------------------------------------
Malwarebytes.org OK Dload & install

fileseeksetup-2.1.0(2).exe OK Dload NO install

Also I never know which programs will install and which will not install until I click in run.

Please help
Thank you