Security system won't let me install hijack this or malwarebytes

Please download and run this tool.

Download Malwarebytes' Anti-Malware from Here

Double Click mbam-setup.exe to install the application.

• Make sure a checkmark is placed next to Update Malwarebytes' Anti-Malware and Launch Malwarebytes' Anti-Malware, then click Finish.
  
• If an update is found, it will download and install the latest version.
  
• Once the program has loaded, select "Perform Quick Scan", then click Scan.
  
• The scan may take some time to finish,so please be patient.
  
• When the scan is complete, click OK, then Show Results to view the results.
  
• Make sure that everything is checked, and click Remove Selected.
  
• When disinfection is completed, a log will open in Notepad and you may be prompted to Restart. (See Note)
  
• The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM.
  

Note:
If MBAM encounters a file that is difficult to remove, you will be presented with 1 of 2 prompts.
Click OK to either and let MBAM proceed with the disinfection process.
If asked to restart the computer, please do so immediately.

Post the contents of the MBAM Log.

Malwarebytes' Anti-Malware 1.39
Database version: 2453
Windows 5.1.2600 Service Pack 3

7/17/2009 7:40:06 PM
mbam-log-2009-07-17 (19-40-06).txt

Scan type: Quick Scan
Objects scanned: 99002
Time elapsed: 4 minute(s), 16 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 0

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

Click Start > Run and copy/paste the following bolded text into the Run box and click OK:

ComboFix /u



This will also reset your restore points.

How is the machine running now?

Excellent. Windows Defender and AVG have stopped detecting problems.

Great, glad we could help

Below I have included a number of recommendations for how to protect your computer in order to prevent future malware infections. Please take these recommendations seriously; these few simple steps can stave off the vast majority of spyware problems. As happy as we are to help you, for your sake we would rather not have repeat customers.

1) Please navigate to http://windowsupdate.microsoft.com and download all the "critical updates" for Windows. This can patch many of the security holes through which attackers can gain access to your computer.

Please either enable Automatic Updates under Start -> Control Panel -> Automatic Updates , or get into the habit of checking for Windows updates regularly. I cannot stress enough how important this is.

2) In order to protect yourself against spyware, you should consider installing and running the following free programs:

Ad-Aware SE
A tutorial on using Ad-Aware to remove spyware from your computer may be found here.

Spybot-Search & Destroy
A tutorial on using Spybot to remove spyware from your computer may be found here. Please also remember to enable Spybot's "Immunize" and "TeaTimer" features.

SpywareBlaster
A tutorial on using SpywareBlaster to prevent spyware from ever installing on your computer may be found here.

SpywareGuard
A tutorial on using SpywareGuard for realtime protection against spyware and hijackers may be found here.

Make sure to keep these programs up-to-date and to run them regularly, as this can prevent a great deal of spyware hassle.

3) Please consider using an alternate browser. Mozilla's Firefox browser is fantastic; it is much more secure than Internet Explorer, immune to almost all known browser hijackers, and also has the best built-in popup blocker (as an added benefit!) that I have ever seen. If you are interested, Firefox may be downloaded from here:
http://www.mozilla.org/products/firefox/
I also recommand the following add-ons for Firefox, they will help keep you safe from malicious scripts or activeX exploits.
https://addons.mozilla.org/en-US/firefox/addon/722
https://addons.mozilla.org/en-US/firefox/addon/1865
https://addons.mozilla.org/en-US/firefox/addon/433

4) Also make sure to run your antivirus software regularly, and to keep it up-to-date.

To help you keep your software updated, please considering using this free software program that will check for program updates.
Update Checker

5) Finally, consider maintaining a firewall. Some good free firewalls are Kerio, or
Outpost
A tutorial on understanding and using firewalls may be found here.

Please also read Tony Klein's excellent article: How I got Infected in the First Place

If you would take a moment to fill out our feedback form, we would appreciate it.
The link can be found here.

Hopefully this should take care of your problems! Good luck.