Wow, you do have a lot of spyware and unneccessary stuff, and it will for sure slow you down, and create conflicts.
Lets forgert about your uninstall problem, and concentrate first on removing the nasties here:
Go to Start/run, and type msconfig.
On the Startup tab, uncheck EVERYTHING, EXCEPT for the following items
StateMgr
LexmarkPrinTray
LexStart
LoadPowerProfile (2x0
PCCIOMON.EXE in 'Run'
PCCIOMON.EXE in 'RunServices'
PCHealth
pop3trap.exe
ScanRegistry
SchedulingAgent
SecondChance
StillImageMonitor
SystemTray
Yahoo!
Click OK, close Msconfig, and reboot (important!)
Now go to Software add/remove and remove New(dot)net application, Webhancer Agent, and Webcelerator.
Reboot AGAIN.
Download and install <A HREF="http://www.lavasoftusa.net/index.html">Ad-Aware</A> . This is a program which scans your system for spyware.
After having downloaded AAW, also download the latest Signature file (Reflist.sig) :
http://www.lavasoftusa.net/aaw/binary/reflist.zip
Unpack it to the Lavasoft Ad-Aware folder in Program Files, and have it overwrite the one that's there.
Then have your drives and registry scanned for spyware, check all found files and reg keys, click continue, and have them removed.
Reboot one last time.
Your computer will thank you for this, and you'll be amazed about how much more smoothly your system will run.
Good luck,