All antivirus programs can remove any items for which they have signatures. BitDefender free has a good scanning engine and generally good removal capability, but it does not provide realtime protection, so it cannot PREVENT infections, only remove them once you're infected.
Keep in mind that to keep your Windows PC secure, you need more than just virus protection- you need a firewall and spyware protection. If you need freeware security applications, you can choose from the following:
firewall: (listed in order of preference)
Comodo (http://www.comodo.com ), or
PC Tools (http://www.pctools.com/firewall )
Comodo recently released version 3.0 of its firewall, which adds an intrusion prevention component that's very effective, though it does take time for it to learn your system, and requires some ongoing attention by the user to make sure programs don't get improperly blocked. Comodo is one of the strongest firewalls available, freeware or commercial, according to the independent testing site matousec.com.
antivirus: (listed in order of preference)
Avira (http://www.free-av.com )
AVAST! Home (http://www.avast.com )
AVG (http://free.grisoft.com )
all provide realtime protection and automatic updates; all have ICSA and VB100 certification, but Avira has been among the highest rated in tests by several respected US and UK computer publications.
antispyware: (listed in order of preference)
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