Welcome :) I do not see any active malware in your log.
Download and scan each user profile with CCleaner:
http://www.ccleaner.com/download/builds
** Select to download the SLIM version.

**Because CCleaner removes everything in temp folders, if you have anything in a temp folder, back it up or move it to a permanent folder prior to running CCleaner.


1. Before first use, select Options > Advanced and UNCHECK
" Only delete files in Windows Temp folder older than 48 hours"
2. Then select the items you wish to clean up.
In the Windows Tab:
• Clean all entries in the "Internet Explorer" section except Cookies (if you want to keep those).
• Clean all the entries in the "Windows Explorer" section.
• Clean all entries in the "System" section.
• Clean all entries in the "Advanced" section.
• Clean any others that you choose.
In the Applications Tab:
• Clean all except cookies (if you want to keep those) in the Firefox/Mozilla section if you use it.
• Clean all in the Opera section if you use it.
• Clean Sun Java in the Internet Section.
• Clean any others that you choose.
3. Click the " Run Cleaner" button.
4. A pop up box will appear advising this process will permanently delete files from your system.
5. Click " OK" and it will scan and clean your system.
6. Click " exit" when done.
REBOOT.


Your Java is out of date. Older versions have vulnerabilities that malware can use to infect your system. It is possible that you may be running Java code in your applications that absolutely require a specific version of the JRE to run. Please follow these steps to remove older version Java components and update.

Updating Java:

• Download the latest version of Java Runtime Environment (JRE) 6.
• Scroll down to where it says "Java Runtime Environment (JRE) 6u6 allows end-users to run Java applications".
• Click the "Download" button to the right.
• Check the box that says: "Accept License Agreement".
• The page will refresh.
• Click on the link to download Windows Offline Installation with or without Multi-language and save to your desktop.
• Close any programs you may have running - especially your web browser.
• Go to Start > Control Panel double-click on Add/Remove programs and remove all older versions of Java.
• Check any item with Java Runtime Environment (JRE or J2SE) in the name.
• Click the Remove or Change/Remove button.
• Repeat as many times as necessary to remove each of the Java versions.
• 
  
• Reboot your computer once all Java components are removed.
• Then from your desktop double-click on jre-6u6-windows-i586-p.exe to install the newest version.

Official JAVA Installation Instructions if needed.

** Be sure to keep your AVG Anti-Virus updated. Please refer to information on AVG v. 8 for installing the new version.

Thank you very much for a quick reply

I have been using CCleaner regularly and everytime approx 30-40mb is cleaned....

I have downloaded java update as per instructions

I have some more problems

1. My computer when purchased(6 months ago) was quite fast....but now it is very slow

2.Windows automatic update is not working

3.When i did a System Health scan (windows tool)

it gave warnings- a)System is experiencing excessive paging

b) Avg. Disk Queue Length : mean - 8, minimum-2, total-16

 

My computer information -

 

OS Name    Microsoft® Windows Vista™ Home Basic
Version    6.0.6000 Build 6000
Other OS Description     Not Available
OS Manufacturer    Microsoft Corporation
System Name    WORKGROUP
System Manufacturer    Dell Inc.
System Model    Inspiron 1520
System Type    X86-based PC
Processor    Intel(R) Core(TM)2 Duo CPU     T5250  @ 1.50GHz, 1500 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date    Dell Inc. A03, 16-08-2007
SMBIOS Version    2.4
Windows Directory    C:\Windows
System Directory    C:\Windows\system32
Boot Device    \Device\HarddiskVolume3
Locale    India
Hardware Abstraction Layer    Version = "6.0.6000.16407"
User Name    WORKGROUP\fanta
Time Zone    India Standard Time
Total Physical Memory    1,013.57 MB
Available Physical Memory    140.35 MB
Total Virtual Memory    2.22 GB
Available Virtual Memory    796.14 MB
Page File Space    1.28 GB
Page File    C:\pagefile.sys
OS Name    Microsoft® Windows Vista™ Home Basic
Version    6.0.6000 Build 6000
Other OS Description     Not Available
OS Manufacturer    Microsoft Corporation
System Name    WORKGROUP
System Manufacturer    Dell Inc.
System Model    Inspiron 1520
System Type    X86-based PC
Processor    Intel(R) Core(TM)2 Duo CPU     T5250  @ 1.50GHz, 1500 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date    Dell Inc. A03, 16-08-2007
SMBIOS Version    2.4
Windows Directory    C:\Windows
System Directory    C:\Windows\system32
Boot Device    \Device\HarddiskVolume3
Locale    India
Hardware Abstraction Layer    Version = "6.0.6000.16407"
User Name    WORKGROUP\fanta
Time Zone    India Standard Time
Total Physical Memory    1,013.57 MB
Available Physical Memory    140.35 MB
Total Virtual Memory    2.22 GB
Available Virtual Memory    796.14 MB
Page File Space    1.28 GB
Page File    C:\pagefile.sys

 

I am very sorry If I'm posting my query in a wrong discussion(hijack this)

But i don't know where else to post it ......................

 

Just to be sure some malware is not hiding, you might try a scan with Malwarebytes' Anti-Malware.
Download to your desktop Malwarebytes' Anti-Malware from Here or 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 Extra Note)
• The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM.

Extra 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.

If you are having a problem with slowness, you may want to consider one of the other free anti-virus programs rather than AVG 8. There is a list at the top of the Virus  & Spyware Board in the "Free Ssecurity Software" announcement.

If you are using Vista settings instead of Classic settings, try changing it back to Classic.

You can disable some services from running at startup and in the background. Follow BlackViper's suggestions:
http://www.blackviper.com/WinVista/servicecfg.htm

 

In addition, please refer to this link for troubleshooting a slow computer:
http://www.dellcommunity.com/supportforums/board/message?board.id=si_virus&thread.id=58687

If all of the above do not help, perhaps the regulars on the Vista Board will have additional suggestions:
http://www.dellcommunity.com/supportforums/board?board.id=vista