You may have disk errors.
Run "check disk" check both options and restart. (runs a long time)
Run Disk Cleanup then Disk Defragment.
4 Ways to Speed Up Your Computer's Performance
http://www.microsoft.com/atwork/getstarted/speed.mspx
If your disk is full, you will not be able to defragment the disk.
If this did not fix the problem:
Start> Run> enter "sfc.exe /scannow" in the run box.
Run. You will need the windows XP disk. This utility will check all system files against the disk and repair if needed.
System File Checker (sfc.exe)
http://www.updatexp.com/scannow-sfc.html
http://www.networkclue.com/os/Windows/commands/sfc.aspx
http://support.microsoft.com/kb/185836
http://support.microsoft.com/kb/310747
If this doesn't work, do a repair install.
Repair install. (should not lose data) Backup files first.
http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/tips/doug92.mspx
http://www.fujitsu-siemens.co.uk/rl/servicesupport/techsupport/software/windows/xp/Repair.htm
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Check for malware
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Update your antivirus and run a full scan in safe mode
If you do not have virus protection install:
AVG Antivirus 7.5 Free Edition
http://free.grisoft.com/freeweb.php/doc/avg-anti-virus-free/lng/us/tpl/v5
http://www.download.com/AVG-Anti-Virus-Free-Edition/3000-2239_4-10669237.html?tag=lst-0-1
or
Free antivirus - avast! 4 Home Edition
http://www.avast.com/eng/avast_4_home.html
or
AOL Active Virus Shield
http://www.activevirusshield.com/antivirus/freeav/index.adp
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Install Windows Defender (full time spyware protection)
Perform a full scan.
http://www.microsoft.com/athome/security/spyware/software/default.mspx
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Install the following five programs and run weekly or at least monthly. You need all five. They are not a substitute for full time spyware and virus protection.
Ad-Aware SE Personal (update + full scan)
http://www.lavasoftusa.com/products/ad-aware_se_personal.php
Spybot Search & Destroy (update + immunize + scan)
Do not enable Tea Timer and SDHelper
After installation: update + scan + immunize
http://www.safer-networking.org/en/mirrors/index.html
SpywareBlaster: Update then open and click “enable all protection”.
http://www.javacoolsoftware.com/spywareblaster.html
SUPERAntiSpyware free version: (update + scan)
http://www.superantispyware.com/
CCleaner: Do not install toolbar option
Removes tracking cookies, unneeded files, history
In options.
Set to run when computer starts.
Place cookies you want to keep in save list
http://www.ccleaner.com/
Note if a scan detects a problem but is unable to remove, start the computer in safe mode with the internet line disconnected and run a full scan.
In severe cases your system restore files will also be infected. In these cases you will need to turn off system restore to prevent malware hiding in the system restore files and reinfecting the computer during removal or during a future system restore. Turning off system restore deletes the system restore files.
Right click on "my computer"> Properties > System Restore Tab > Check box turn of system restore
After the malware is removed turn on system restore.
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Run this time only
CWShredder: run
http://www.trendmicro.com/cwshredder/
Roguefix.bat
http://www.internetinspiration.co.uk/roguefix.htm#uninstall
Shoot The Messenger
http://www.grc.com/stm/shootthemessenger.htm
SmitFraudFix
http://www.geekstogo.com/forum/How_to_use_SmitFraudFix-t109268.html
Vundo Fix and
VirtumundoBegone (if VundoFix does not work)
http://www.bleepingcomputer.com/forums/topic18610.html
VX2 tool for Ad-Aware and run tool (Install and run)
http://www.lavasoftusa.com/support/securitycenter/vx2_cleaner.php
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Additional run this time and monthly
Microsoft Update "Custom Mode"
Install everything, reboot and repeat until nothing is left.
Review update history for failed updates and look up update on microsoft and reinstall.
http://update.microsoft.com/microsoftupdate/v6/default.aspx?ln=en-us
Microsoft OneCare Live, run “full service scan”
Updates windows, virus and spyware scan, disk cleanup, disk fragmentation (if needed), backs up registry and then cleans registry, and checks for open firewall ports
http://onecare.live.com/site/en-us/default.htm
Malicious Software Removal Tool (run “full scan”)
http://www.microsoft.com/security/malwareremove/default.mspx
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Rootkit Removal Guide
http://safecomputing.umn.edu/guides/scan_unhackme.html
Rootkits Removers
Pick any 2 install and run one each month
AVG Anti-Rootkit
http://www.grisoft.com/doc/products-avg-anti-rootkit-update-app-art/?ver=1.1.0.29
F-Secure BlackLight
http://www.f-secure.com/blacklight/
Sophos Anti-Rootkit
http://www.sophos.com/products/free-tools/sophos-anti-rootkit.html
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Online Free Scanners:
Run Trend Micro, Kaspersky, and Panda Scan now.
Run a different one each month.
Trend Micro: HouseCall Free Scan (removes what it finds)
http://housecall.trendmicro.com/
BitDefender Online Scanner http://www.bitdefender.com/scan8/ie.html
Kaspersky Labs Online Scanner http://www.kaspersky.com/virusscanner
McAfee http://us.mcafee.com/root/mfs/default.asp?affid=294
Panda ActiveScan Free Online Scanner http://www.pandasoftware.com/products/activescan?
Symantic Online Scanner http://security.symantec.com/sscv6/ssc_eula.asp?langid=ie&venid=sym&plfid=23&pkj=ALUFRHYTINMHDKDCWLL&vc_scanstate=2
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Additional Information read:
http://wiki.castlecops.com/Malware_Removal_and_Prevention:_Overview
http://wiki.castlecops.com/Malware_Prevention:_Prevent_Re-infection
http://www.castlecops.com/f67-Hijackthis_Spyware_Viruses_Worms_Trojans_Oh_My.html
http://aumha.org/a/quickfix.htm
http://aumha.org/secure.htm
http://aumha.org/a/parasite.php
http://www.castlecops.com/t102301-Hijackthis_Guidelines_Read_Before_Posting.html
http://www.techsupportforum.com/security-center/hijackthis-log-help/15968-please-read-before-posting-
http://forum.aumha.org/viewtopic.php?t=4075&sid=901703d08c2ace31389ffef2d84b6607