Some Good Links

Microsoft Sysinternals
http://technet.microsoft.com/en-us/sysinternals/default.aspx

HijackThis
http://www.trendsecure.com/portal/en-US/tools/security_tools/hijackthis

Portable Apps – Copy and run softwares for your pen drives
http://portableapps.com/

7Zip
http://www.7-zip.org/

DFX – Audio enhancement for winamp, WMP, etc
http://www.fxsound.com/

SRS WOW – Audio enhancement
http://www.srslabs.com/

Foxit Reader – PDF reader
http://www.foxitsoftware.com/pdf/rd_intro.php