HELP PLEASE!! ~NEW TROJAN/ADWARE/HACKTOOL/SPYWARE THREATS!!!

WINDOWS XP
I previously had problems with threats and now got new ones. I tried to remove & clean (I think?! ??? ???). I cleared ALL TEMP folders & tried to follow the steps as from the previous help, so I am not sure if I did it correctly but still need assistance. I also keep getting a message saying that virtual memory too low. Could this be affected by the infected files?..THANKS
Please see below:
-TROJAN StartPage.1505
-TROJAN FakeAlert
-Adware.Pors
-Tool.Prockill (hacktool program)
-Spyare:RealTracker, AdBureau & Tracking Co
Threats found in:
Tool.Prockill (Hacktool program)
c:/system volume information/_restore{b37680b2-ba0a-4e5d-bf30-83e44c588624}/rp211/20053253.exe
c:/system volume information/_resotre{b37680b2-b202-4e5d-bf30-83e44c588624}/rp204/a0050418.exe

Trojan (FakeAlert & StartPage.1505)
FakeAlert - c:/system volume information/_restore{b37680b2-ba0a-4e5d-bf30-83e44c588624}/rp203/a0050373.dll
StartPage.1505 -c:/system volume information/_restore{b376802b2-ba0a-4e5d-bf30-83e44c588624}rp205/a005097.reg
StartPage.1505 -c:/system volume information/_restore{b37680b2-ba0a-4e5d-bf30-83e44c588624}/rp209/a0052241.reg
StartPage.1505 -c:/documents and settings/allusers/application data/spy-bot -search & destroy/snapshots2/regubp2b-lesa.reg

Adware.Pors
c:/system volume information/_restore{b37680b2-4e5d-bf30-83e44c588624}/rp200/a0049099.dll
c:/system information/_restore{b37680b2-4e5d-bf30-83e44c588624}/rp203/20050371.dll
c:/system volume information/_restore{b37680b2-ba0a-4e5d-bf30-83e44c588624}/rp203/20050371.dll

It is not new threats but old ones. All these malware are residing in the some previous System Restore points.

Clear your old restore points and create a new one.