Update your anti-virus, remember to only have one anti-virus installed on your PChttp://www.avast.com/eng/download-avast-… [Free home edition]
Download SuperAntiSpywarehttp://www.superantispyware.com/superant… [Free home edition]
Restart your PC in safe mode, and run a full scan with both.http://www.pchell.com/support/safemode.s…
While in safe mode, you may also want to have a look at your start up items by using msconfig.http://www.netsquirrel.com/msconfig/
Be careful with the items you uncheck, you can have a look here to see if they are necessaryhttp://www.greatis.com/appdata/index.htm…
You should also have a look at your IE Add-ons while in safe mode.http://www.microsoft.com/windowsxp/using…
Disable any you do not use.
After you reboot back to normal mode, download and install ccleaner to fix any registry problems and clean up old temp files.http://www.ccleaner.com [Free]
Then run a disk clean uphttp://support.microsoft.com/kb/310312
And a defraghttp://support.microsoft.com/kb/314848

For your viruses, I reccomend Windows Defender [ from Microsoft ] and ClamWin [ open-source ], or AVG Free [ by Grisoft ].
Here are their sites:
Clamwin: http://www.clamwin.com/
AVG Free: http://free.avg.com/
Windows Defender: http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
As for your ‘errors’, you’ll have to provide us with more details as there are thousands upon millions of possible errors.

uninstall any security program you are using and install these free programs
1-Anti-virus
a-avira personal classic edition(free)http://www.download.com/Avira-AntiVir-Pe…
2-Anti-spyware
a-super antispyware freehttp://www.download.com/SUPERAntiSpyware…
b- a-squared freehttp://www.download.com/A-squared-Free/3…
c-spyware terminator(free)http://www.download.com/Spyware-Terminat…
3-firewall
a-comodo firewall pro(free) (after installing it go to firewall tab then stealth port wizard and set it to block all incoming conections)
note:this won’t p2p propgrams(limewire,bitcomet and etc)http://www.download.com/Comodo-Firewall-…
4-browser
a-firefox 3.0http://www.download.com/mozilla-firefox/…
5-browser add-ons(firefox)
a-mcafee site advisorhttp://www.download.com/McAfee-SiteAdvis…
b-Adblock Plushttps://addons.mozilla.org/en-US/firefox…
6-pc utilties
ccleaner:http://www.download.com/CCleaner/3000-21…
eusing free registrycleaner:http://www.eusing.com/free_registry_clea…

I’d say download Avast! Antivirus Home Edition here: http://www.avast.com/eng/download-avast-home.html
This will protect you from opening dangerous files, visiting dangerous sites, etc when it’s running.. I haven’t got a single problem with my computer since i got Avast.
Another good program for scanning you computer, but not for constant protection, is the free version of Ad-Aware. http://www.download.com/Awhichd-Aware-2008/3000-8022_4-10045910.html?part=dl-ad-aware&subj=dl&tag=top5&cdlPid=10844457
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youll need money, because your best bet is mc affee virus protection. it will locate the infected files and remove them from your computer. thats all i can tell you.

go to download.com and download a virus protection program.

AVG and Avast are the best free anti-virus. As far as problems…well it depends on what problems you have.