Do you know when this problem first started?
Does the computer freeze using any other program or even when it is idle?
Is the computer exhibiting any other problems or anomalies?
What I suggest is that you update your anti-virus program and run a complete scan.
Download, install and update the freeware version of Adaware and then scan in safe mode (which is accessed by tapping the F8 key while the computer first boots - before Windows starts):
Ad-Aware SE Personal - freeware http://fileforum.betanews.com/detail/Adawa...nal/965718306/1
Allow it to remove or quarantine whatever it finds.
After that, use the following web based anti-malware scans to detect and remove various kind of malware that your av program doesn't address. Each may find malware the others may miss, so run at least three:
Trend Micro antivirus and malware scan:http://housecall-beta.trendmicro.com/en/st...orp.asp?id=scan
Etrust Anti-virus web scannerhttp://www3.ca.com/securityadvisor/virusinfo/scan.aspx
Avast Online scanhttp://onlinescan.avast.com/
F Secure online scanhttp://support.f-secure.com/ols/start.html
Trojan scans –
Then scan with the following which specialize in trojans, autodialers and phonehomes:
Windows Security Trojanscanhttp://windowsecurity.com/trojanscan
See instructions for it here:http://www.windowsecurity.com/trojanscan/trojanscan.asp
Parasite scan from Aumha:http://www.aumha.org/a/noads.php
One other thing to try is to download and install the Firefox Browser.
You can have several browsers on your computer at the same time.
Try Firefox and see if it freezes as well.http://www.mozilla.com/firefox/
You may even prefer it to Internet Explorer for most uses, but you must use IE to access Windows Updates and other websites that require Active X to operate, such as the on-line scans I listed above.
Let us know the results.